PRIME MEDICAL SERVICES INC /TX/
S-8, 1998-08-26
MISC HEALTH & ALLIED SERVICES, NEC
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         As filed with the Securities and Exchange Commission on August 26, 1998
                                                        Registration No. 333-___

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549


                                    FORM S-8
                             REGISTRATION STATEMENT
                                      Under
                           The Securities Act of 1933


                          PRIME MEDICAL SERVICES, INC.
             (Exact name of registrant as specified in its charter)
          Delaware                                  74-2652727
    (State or other jurisdiction of               (I.R.S. Employer
     Incorporation or organization)                Identification No.)

                   1301 Capital of Texas Highway, Suite C-300
                            Austin, Texas 78746-6550
              (Address of registrant's principal executive offices)
                PRIME MEDICAL SERVICES, INC. AMENDED AND RESTATED
                             1993 STOCK OPTION PLAN
                            (Full title of the plan)

                               KENNETH S. SHIFRIN
                          Prime Medical Services, Inc.
                   1301 Capital of Texas Highway, Suite C-300
                            Austin, Texas 78746-6550
                                 (512) 328-2892
                       (Name, address and telephone number
                       of registrant's agent for service)

                                   Copies to:

                               TIMOTHY L. LA FREY
                    Akin, Gump, Strauss, Hauer & Feld, L.L.P.
                              1900 Frost Bank Plaza
                               816 Congress Avenue
                               Austin, Texas 78701
                                 (512) 499-6200


This Registration  Statement shall become effective immediately upon filing with
the Securities and Exchange Commission,  and sales of the registered  securities
will thereafter be effected upon option exercises under the Plan.
                    
                         CALCULATION OF REGISTRATION FEE

<TABLE>

====================================================================================================================================
<S>       <C>                               <C>                       <C>                  <C>    

          Title of securities               Proposed maximum           Offering            Proposed maximum            Amount of
           to be registered                   amount to be               price                 aggregate           registration fee
                                             registered(1)             per share            offering price
- -----------------------------------------------------------------------------------------------------------------------------------

Common Stock, $.01 par value(1)......             750,000               $7.875(2)           $5,906,250(2)           $1,742.35(2)
===================================================================================================================================
</TABLE>

     (1)  Pursuant to Rule 416, there are also being  registered such additional
          shares  of  common  stock  as  may  become  issuable  pursuant  to the
          antidilution  provisions of the Plan. This Registration Statement also
          pertains  to  rights  to  purchase  shares  of  Common  Stock  of  the
          Registrant.  One right is  attached  to and trades  with each share of
          Common  Stock of the  Registrant.  Until  the  occurrence  of  certain
          events,  the rights are not  exercisable  and will not be evidenced or
          transferred apart from the Common Stock.
     (2)  Estimated  solely for the purpose of calculating the  registration fee
          in accordance  with Rule 457(c) and Rule 457(h),  using the average of
          the high and low sales prices  reported on The Nasdaq  National Market
          for the Registrant's Common Stock on August 24, 1998.


<PAGE>



                                     PART II

               Information Required in the Registration Statement

     Item 3. Incorporation of Documents by Reference

     Prime  Medical  Services,  Inc.,  formerly  known as New  PMSI,  Inc.  (the
"Company")  has  previously   filed  a  Registration   Statement  on  Form  S-8,
Registration  No.  333-33743 with the Securities  and Exchange  Commission  (the
"Commission")  with respect to the registration of securities of the same class,
relative to the same employment benefit plan, as the securities being registered
pursuant to this Registration Statement.

     The  Company  hereby  incorporates  by  reference  into  this  Registration
Statement the following documents previously filed with the Commission:

                  (a)  The Form S-8  Registration  Statement  filed  by the 
Company  on August  15,  1997  with  the  Commission  as   Registration   No.
333-33743;
                  (b) The  Company's  Annual  Report on Form  10-K/A (as amended
April, 30, 1998);

                  (c) The Company's Quarterly Report on Form 10-Q for the period
ended March 31, 1998;

                  (d) The Company's Quarterly Report on Form 10-Q for the period
ended June 30, 1998;

                  (e) The description of the Company's  outstanding Common Stock
contained in the Company's Form 8-A, dated September 14, 1993; and

                  (f) The  description of the rights issued to  stockholders  of
the Company contained in the Company's Form 8-A, dated March 10, 1994.

                  All  reports  and other  documents  subsequently  filed by the
Company  pursuant  to  Sections  13(a),  13(c),  14 and 15(d) of the  Securities
Exchange  Act of 1934,  as  amended,  prior to the  filing  of a  post-effective
amendment which  indicates that all securities  offered hereby have been sold or
which  deregisters all securities then remaining  unsold,  shall be deemed to be
incorporated  by reference  into this  Registration  Statement  and to be a part
hereof from the date of filing of such documents. Any statement contained herein
or in any document incorporated or deemed to be incorporated by reference herein
shall be deemed to be modified or superseded  for purposes of this  Registration
Statement  to the  extent  that a  statement  contained  herein  or in any other
subsequently  filed  document which also is or is deemed to be  incorporated  by
reference  herein modifies or supersedes  such statement.  Any such statement so
modified  or  superseded  shall  not be  deemed  to  constitute  a part  of this
Registration Statement, except as so modified or superseded.

Item 8.  Exhibits

         Exhibit Number                             Exhibit

                  5.1             Opinion of Akin, Gump, Strauss, Hauer & Feld,
                                  L.L.P.

                  23.1            Consent of Akin, Gump, Strauss, Hauer &
                                  Feld, L.L.P. (included in the Opinion filed
                                  as Exhibit 5.1 to this Registration Statement)

                  23.2            Consent of KPMG Peat Marwick LLP

                  24.1            Power of Attorney (reference is made to the
                                  Signature Page of this Registration
                                  Statement)

                  99.1            Prime Medical Services, Inc. Amended and 
                                  Restated 1993 Stock Option Plan of Prime 
                                  Medical Services, Inc.




<PAGE>



                                SIGNATURES

     Pursuant to the  requirements of the Securities Act of 1933, the registrant
certifies  that it has  reasonable  grounds to believe  that it meets all of the
requirements  for  filing  on Form S-8 and has  duly  caused  this  Registration
Statement  to be  signed  on its  behalf  by  the  undersigned,  thereunto  duly
authorized,  in the City of Austin,  State of Texas, on this 26th day of August,
1998.


                                    PRIME MEDICAL SERVICES, INC.


                                    By       /s/: Cheryl Williams
                                             --------------------
                                             Cheryl Williams
                                             Vice President-Finance

                                POWER OF ATTORNEY

KNOW ALL PERSONS BY THESE PRESENTS:

         That the undersigned  officers and directors of Prime Medical Services,
Inc.,  a Delaware  corporation,  do hereby  constitute  and  appoint  Kenneth S.
Shifrin and Cheryl Williams, and each of them, the lawful  attorneys-in-fact and
agents  with full power and  authority  to do any and all acts and things and to
execute any and all instruments which said attorneys and agents,  and either one
of them,  determine  may be  necessary  or  advisable or required to enable said
corporation to comply with the Securities Act of 1933, as amended, and any rules
or regulations  or  requirements  of the  Securities and Exchange  Commission in
connection with this Registration Statement.  Without limiting the generality of
the foregoing  power and  authority,  the powers  granted  include the power and
authority to sign the names of the  undersigned  officers  and  directors in the
capacities  indicated  below  to  this  Registration  Statement,  to any and all
amendments,  both  pre-effective  and  post-effective,  and  supplements to this
Registration  Statement,  and to any and all  instruments or documents  filed as
part of or in  conjunction  with this  Registration  Statement or  amendments or
supplements  thereof,  and each of the undersigned  hereby ratifies and confirms
all that said attorneys and agents,  or either of them,  shall do or cause to be
done by  virtue  hereof.  This  Power  of  Attorney  may be  signed  in  several
counterparts.

         IN WITNESS WHEREOF,  each of the undersigned has executed this Power of
Attorney as of the date indicated.


           Signature                     Title                      Date


/s/: Kenneth S. Shifrin            Chairman of the Board and     August 26, 1998
- ---------------------------        Director 
    KENNETH S. SHIFRIN                                                         


/s/: Joseph Jenkins, M.D.          President, Chief Executive    August 26, 1998
- ---------------------------        Officer and Director
    JOSEPH JENKINS, M.D.                   


/s/: Cheryl Williams               Chief Financial Officer,      August 26, 1998
- ---------------------------        Vice President-Finance and
    CHERYL WILLIAMS                Secretary (Chief Accounting 
                                   Officer)


/s/: Paul R. Butrus                Director                      August 26, 1998
- ---------------------------                                                    
    PAUL R. BUTRUS


/s/: William E. Foree, M.D.        Director                      August 26, 1998
- ---------------------------  
    WILLIAM E. FOREE, M.D.


/s/: Irwin Katz                    Director                      August 26, 1998
- ---------------------------                  
    IRWIN KATZ


/s/: John A. McEntire              Director                      August 26, 1998
- ---------------------------             
    JOHN A. MCENTIRE IV



/s/: William A. Searles            Director                      August 26, 1998
- ---------------------------                               
    WILLIAM A. SEARLES



/s/: Michael J. Spalding, M.D.     Director                      August 26, 1998
- ------------------------------                                             
    MICHAEL J. SPALDING, M.D.





<PAGE>



                                INDEX TO EXHIBITS


                                                                  Sequentially
                                                                    Numbered
Exhibit Number     Exhibit                                            Page

     5.1           Opinion of Akin, Gump, Strauss, Hauer & Feld,       i
                   L.L.P.                                    

     23.1          Consent of Akin, Gump, Strauss, Hauer & Feld,
                   L.L.P. (included in the Opinion filed as
                   Exhibit 5.1 to this Registration Statement)

     23.2          Consent of KPMG Peat Marwick LLP                    ii

     24.1          Power of Attorney (reference is made to the
                   Signature Page of this Registration Statement)

     99.1          Prime Medical Services, Inc. Amended and            iii
                   Restated 1993 Stock Option Plan               












                                   EXHIBIT 5.1




<PAGE>




                                                                 August 26, 1998

Prime Medical Services, Inc.
1301 Capital of Texas Highway
Suite C-300
Austin, Texas 78746

Gentlemen:

          We have acted as counsel to Prime Medical  Services,  Inc., a Delaware
corporation  (the  "Company"),  in  connection  with  the  registration,  on the
Company's Registration  Statement on Form S-8 (the "Registration  Statement") to
be filed under the Securities Act of 1933, as amended (the "Securities Act"), of
the offer and sale of an aggregate of 750,000 shares of common stock,  par value
$.01 per share,  of the  Company  (the  "Common  Stock"),  as that number may be
adjusted from time to time pursuant to the  provisions of the Company's  Amended
and Restated 1993 Stock Option Plan, as amended (the "Plan"), that may be issued
pursuant to stock options (the "Options") granted under the Plan.

          In reaching the opinion set forth herein,  this firm has reviewed such
agreements,  certificates  of public  officials  and  officers  of the  Company,
records, documents, and matters of law that this firm deemed relevant, including
(a) the  Registration  Statement,  (b) the Certificate of  Incorporation  of the
Company, (c) the Bylaws of the Company, and (d) the Plan.

         Based upon and  subject to the  foregoing  and  subject  further to the
assumptions,  exceptions,  and  qualifications  hereinafter  stated,  this  firm
expresses the opinion that each share of Common Stock, when issued in accordance
with the terms of the Plan and related option agreement, will be legally issued,
fully paid, and non-assessable.

          The opinion  expressed above is subject to the following  assumptions,
exceptions, and qualifications:

          1. This firm has assumed  that (i) all  information  contained  in all
documents reviewed by this firm is true and correct,  (ii) all signatures on all
documents  reviewed by this firm are genuine,  (iii) all documents  submitted to
this firm as originals  are true and complete,  (iv) all documents  submitted as
copies are true and complete copies of the originals  thereof,  (v) each natural
person  signing any document  reviewed by this firm had the legal capacity to do
so and (vi) each  person  signing  in a  representative  capacity  any  document
reviewed by this firm had authority to sign in such capacity.

         2. This firm has also  assumed  that the Company  has  received or will
receive the full amount and type of consideration  (as specified in the Plan and
each applicable option agreement) for each of the shares of Common Stock or will
have received that  consideration  upon the issuance of Common Stock pursuant to
the applicable  Option,  that such consideration will be either cash or personal
property,  that such  consideration will equal or exceed the par value per share
of Common Stock,  that appropriate  certificates  evidencing such shares will be
properly executed upon such issuance,  and that each grant of an Option pursuant
to the Plan will be duly authorized.

          The opinions  expressed  above are limited to the laws of the State of
Texas and the General  Corporation  Law of the State of Delaware.  You should be
aware  that this firm is not  admitted  to the  practice  of law in the State of
Delaware and the opinion herein as to the General  Corporation  law of the State
of  Delaware  is based  solely upon the latest  unofficial  compilation  thereof
available to this firm.

         This opinion may be filed as an exhibit to the Registration  Statement.
In giving this  consent,  we do not thereby admit that we come into the category
of persons whose consent is required  under Section 7 of the  Securities  Act or
the rules and regulations of the Securities and Exchange Commission  promulgated
thereunder.

                              Very truly yours,

                              AKIN, GUMP, STRAUSS, HAUER & FELD, L.L.P.

                              By:     /s/ Timothy L. LaFrey
                                      -----------------------------
                                      Timothy L. LaFrey, Partner










                                  EXHIBIT 23.2




<PAGE>





                          INDEPENDENT AUDITORS' CONSENT
           ----------------------------------------------------------



The Board of Directors
Prime Medical Services, Inc.:

We consent to the use of our report incorporated herein by reference.


/s/ KPMG PEAT MARWICK LLP
- -------------------------
KPMG PEAT MARWICK LLP

Austin, Texas
August 26, 1998














                                  EXHIBIT 99.1


                                      


<PAGE>










                          PRIME MEDICAL SERVICES, INC.
                              AMENDED AND RESTATED
                             1993 STOCK OPTION PLAN


                            Scope and Purpose of Plan

         Prime   Medical   Services,   Inc.,   a   Delaware   corporation   (the
"Corporation"),  has adopted  this Stock Option Plan (the "Plan") to provide for
the granting of:

         Incentive Options (hereinafter defined) to certain key employees of the
Corporation, or of its Affiliates (hereinafter defined), and

         Non-Incentive  Options  (hereinafter  defined) to certain key employees
and nonemployee directors of the Corporation or of its Affiliates.

The  purpose of the Plan is to provide an  incentive  for  Eligible  Individuals
(hereinafter  defined)  to  remain  in the  service  of the  Corporation  or its
Affiliates,  to extend to them the opportunity to acquire a proprietary interest
in the Corporation so that they will apply their best efforts for the benefit of
the Corporation,  and to aid the Corporation in attracting able persons to enter
the  service  of the  Corporation  and its  Affiliates.  On June 10,  1998,  the
shareholders of the Corporation  approved an amendment  increasing the number of
shares of Common  Stock  (as  defined  below)  which may be issued  pursuant  to
Options (as defined  below)  granted under the Plan from 2,500,000 to 3,250,000.
The Plan was  originally  executed  on October  12,  1993 and  incorporates  all
amendments through June 10,1998.

SECTION 1.    Definitions
- ----------    -----------

     1.1.  "Act" shall mean the Securities Exchange Act of 1934, as amended.

     1.2.  "Affiliates"  shall  mean  (a)  any  corporation,   other  than  the
Corporation, in an unbroken chain of corporations ending with the Corporation if
each of the  corporations,  other than the  Corporation,  owns stock  possessing
fifty percent (50%) or more of the total combined voting power of all classes of
stock in one of the other  corporations  in such chain and (b) any  corporation,
other than the Corporation,  in an unbroken chain of corporations beginning with
the Corporation if each of the corporations,  other than the last corporation in
the unbroken  chain,  owns stock  possessing  fifty percent (50%) or more of the
total  combined  voting  power  of all  classes  of  stock  in one of the  other
corporations in such chain.

     1.3.  "Agreement"  shall mean the written agreement between the Corporation
and  a  Holder  evidencing  the  Option  granted  by  the  Corporation  and  the
understanding of the parties with respect thereto.

     1.4.  "Board of Directors" shall mean the board of directors of the
Corporation.

     1.5.  "Code" shall mean the Internal Revenue Code of 1986, as amended.

     1.6.  "Administrator"  shall mean the Administrator  appointed  pursuant to
Section 3.1 to administer the Plan.

     1.7.  "Non-Employee Directors" shall mean directors who meet the definition
of "Non-Employee Directors" under Rule 16b-3 under the Act.

     1.8. "Effective Date" shall mean the date that PMSI Acquisition Corporation
is merged with and into Prime Medical Services, Inc.

     1.9.  "Eligible  Individuals"  shall  mean  (a)  key  employees,  including
officers and directors who are also  employees of the  Corporation  or of any of
its Affiliates,  (b) nonemployee directors and officers of the Corporation or of
any of its Affiliates and (c)  consultants and advisors of the Corporation or of
any of its Affiliates who render bona fide services to the Corporation or of any
of its  Affiliates;  provided such  services must not be in connection  with the
offer or sale of securities in a capital-raising transaction.

     1.10.  "Fair Market Value" shall mean:

     (a) If shares of Stock of the same class are listed or admitted to unlisted
trading privileges on any national or regional  securities  exchange at the date
of  determining  the Fair Market  Value,  the last  reported  sale price on such
exchange on the last business day prior to the date in question; or

     (b) If shares of Stock of the same class shall not be listed or admitted to
unlisted trading privileges as provided in Subparagraph 1.10(a) and sales prices
therefor  in the  over-the-counter  market  shall be  reported  by the  National
Association of Securities Dealers,  Inc. Automated  Quotations,  Inc. ("NASDAQ")
National  Market System at the date of  determining  the Fair Market Value,  the
last  reported sale price so reported on the last business day prior to the date
in question; or

     (c) If shares of Stock of the same class shall not be listed or admitted to
unlisted trading privileges as provided in Subparagraph 1.10(a) and sales prices
therefor shall not be reported by the NASDAQ  National Market System as provided
in   Subparagraph   1.10(b),   and  bid  and  asked   prices   therefor  in  the
over-the-counter  market shall be reported by NASDAQ (or, if not so reported, by
the National Quotation Bureau  Incorporated) at the date of determining the Fair
Market  Value,  the  average  of the  closing  bid and asked  prices on the last
business day prior to the date in question; and

     (d) If shares of Stock of the same class shall not be listed or admitted to
unlisted trading privileges as provided in Subparagraph 1.10(a) and sales prices
or bid and asked  prices  therefor  shall  not be  reported  by  NASDAQ  (or the
National Quotation Bureau  Incorporated) as provided in Subparagraph  1.10(b) or
Subparagraph 1.10(c) at the date of determining the Fair Market Value, the value
determined in good faith by the Administrator. For purposes of valuing Incentive
Options,  the Fair Market Value of Stock shall be determined  without  regard to
any restriction other than one which, by its terms, will never lapse.

     1.11. "Holder" shall mean an Eligible Individual to whom an Option has been
granted.

     1.12.  "Incentive  Options"  shall mean stock  options that are intended to
satisfy the requirements of section 422A of the Code.

     1.13.  "Non-Incentive Options" shall mean stock options that do not satisfy
the requirements of section 422A of the Code.

     1.14.  "Options"  shall mean  either  Incentive  Options  or  Non-Incentive
Options, or both.

     1.15.  "Stock" shall mean the  Corporation's  authorized common stock, $.01
par value,  together  with any other  securities  with respect to which  Options
granted hereunder may become exercisable.

SECTION 2.        Stock and Maximum Number of Shares Subject to the Plan.
- ----------        -------------------------------------------------------

     2.1.  Description  of Stock and Maximum Shares  Allocated.  The Stock which
Options granted hereunder give a Holder the right to purchase may be unissued or
reacquired  shares of Stock,  as the  Corporation  may, in its sole and absolute
discretion, from time to time determine.

         Subject to the  adjustments  provided for in Paragraph 6.7 hereof,  the
aggregate number of shares of Stock to be issued pursuant to the exercise of all
Options  granted  hereunder may equal but shall not exceed  3,250,000  shares of
Stock.

     2.2.  Restoration of  Unpurchased  Shares.  If an Option granted  hereunder
expires or  terminates  for any reason during the term of this Plan and prior to
the  exercise  of the  Option in full,  the  shares of Stock  subject to but not
issued under such Option shall again be available for Options granted  hereunder
subsequent thereto.

SECTION 3.   Administration of the Plan.
- ----------   ---------------------------

     3.1.  Administrator.  An  administrative  body  designated  by the Board of
Directors  shall  administer  the  Plan  (the  "Administrator").  The  Board  of
Directors  may  designate  itself as the  Administrator  or appoint  two or more
Non-Employee Directors to a committee which shall serve as the Administrator.

     3.2.  Meetings and Actions of Administrator.  The Administrator  shall hold
its meetings at such times and places as it may  determine.  All  decisions  and
determinations  of the  Administrator  shall  be  made by the  majority  vote or
decision of all of its members present at a meeting; provided, however, that any
decision or determination reduced to writing and signed by all of the members of
the  Administrator  shall be as  fully  effective  as if it had  been  made at a
meeting  duly  called  and  held.  The  Administrator  may  make any  rules  and
regulations for the conduct of its business that are not  inconsistent  with the
provisions  hereof  and  with  the  bylaws  of the  Corporation  as it may  deem
advisable.

     3.3.  Administrator's Powers. Subject to the express provisions hereof, the
Administrator shall have the authority, in its sole and absolute discretion, (a)
to  adopt,  amend,  and  rescind   administrative  and  interpretive  rules  and
regulations  relating to the Plan;  (b) to determine the terms and provisions of
the respective  Agreements (which need not be identical),  including  provisions
defining or otherwise relating to (i) subject to Section 6 of the Plan, the term
and the period or periods and extent of exercisability of the Options,  (ii) the
extent to which the  transferability  of shares of Stock issued upon exercise of
Options  is  restricted,  and (iii) the  effect of  approved  leaves of  absence
(consistent with any applicable  regulations of the Internal  Revenue  Service);
(c) to  accelerate  the  time of  exercisability  of any  Option  that  has been
granted; (d) to construe the respective Agreements and the Plan; and (e) to make
all other  determinations  and perform all other acts necessary or advisable for
administering  the Plan,  including the delegation of such  ministerial acts and
responsibilities as the Administrator  deems appropriate.  The Administrator may
correct any defect or supply any omission or reconcile any  inconsistency in the
Plan or in any Agreement in the manner and to the extent it shall deem expedient
to carry it into  effect,  and it  shall  be the  sole and  final  judge of such
expediency.   The   Administrator   shall  have  full  discretion  to  make  all
determinations   on  the  matters  referred  to  in  this  Paragraph  3.3;  such
determinations shall be final, binding and conclusive.

SECTION 4.   Eligibility and Participation.
- ----------   ------------------------------

     4.1. Eligible Individuals. Options may be granted hereunder only to persons
who are Eligible  Individuals at the time of the grant thereof.  Notwithstanding
any provision  contained herein to the contrary,  a person shall not be eligible
to  receive  an  Incentive  Option  hereunder  unless he is an  employee  of the
Corporation  or an  Affiliate,  nor shall a person be  eligible  to  receive  an
Incentive Option hereunder if he, at the time such Option is granted,  would own
(within the meaning of sections 422A and 425 of the Code) stock  possessing more
than  ten  percent  (10%) of the  total  combined  voting  power or value of all
classes of stock of the  Corporation or of an Affiliate  unless at the time such
Incentive  Option is granted the  exercise  price per share of Stock is at least
one  hundred and ten  percent  (110%) of the Fair Market  Value of each share of
Stock to which the  Incentive  Option  relates and the  Incentive  Option is not
exercisable after the expiration of five years from the date it is granted.

     4.2 No Right to  Option.  The  adoption  of the Plan shall not be deemed to
give any person a right to be granted an Option.

SECTION 5.  Grant of Options and Certain Terms of the Agreements.
- ----------  -----------------------------------------------------

     Subject to the express provisions hereof, the Administrator shall determine
which Eligible Individuals shall be granted Options hereunder from time to time.
In  making  grants,   the  Administrator   shall  take  into  consideration  the
contribution  the  potential  Holder has made or may make to the  success of the
Corporation or its Affiliates and such other considerations as the Administrator
may from time to time specify. The Administrator shall also determine the number
of shares  subject to each of such  Options,  and shall  authorize and cause the
Corporation to grant Options in accordance with such determinations.

     The date on which the  Administrator  completes all action  constituting an
offer of an Option to an individual,  including the  specification of the number
of shares of Stock to be subject to the  Option,  shall be the date on which the
Option  covered by an Agreement  is granted,  even though  certain  terms of the
Agreement may not be at such time  determined  and even though the Agreement may
not be executed until a later time. In no event, however, shall an Optionee gain
any rights in addition to those  specified  by the  Administrator  in its grant,
regardless  of the time that may pass  between  the grant of the  Option and the
actual execution of the Agreement by the Corporation and the Optionee.

     Each Option granted hereunder shall be evidenced by an Agreement,  executed
by the  Corporation  and the Eligible  Individual to whom the Option is granted,
incorporating such terms as the Administrator shall deem necessary or desirable.
More than one Option may be granted  hereunder to the same  Eligible  Individual
and be outstanding  concurrently  hereunder. In the event an Eligible Individual
is granted  both one or more  Incentive  Options  and one or more  Non-Incentive
Options, such grants shall be evidenced by separate Agreements,  one for each of
the Incentive Option grants and one for each of the Non-Incentive Option grants.

         Each Agreement may contain or otherwise  provide for conditions  giving
rise to the  forfeiture  of the Stock  acquired  pursuant  to an Option  granted
hereunder or otherwise and such restrictions on the transferability of shares of
the Stock acquired  pursuant to an Option granted  hereunder or otherwise as the
Administrator  in  its  sole  and  absolute  discretion  shall  deem  proper  or
advisable.  Such conditions giving rise to forfeiture may include,  but need not
be limited to, the requirement  that the Holder render  substantial  services to
the  Corporation  or  its  Affiliates  for a  specified  period  of  time.  Such
restrictions on transferability may include, but need not be limited to, options
and rights of first refusal in favor of the Corporation and  shareholders of the
Corporation  other than the Holder of such shares of Stock who is a party to the
particular  Agreement or a subsequent holder of the shares of Stock who is bound
by such  Agreement.  In addition,  no Option may be exercisable  for a period of
more than ten years from the date the Option is granted.

SECTION 6.   Terms and Conditions of Options.
- ----------   --------------------------------

         All Options granted  hereunder shall comply with, be deemed to include,
and shall be subject to the following terms and conditions:

     6.1.  Number of Shares.  Each Agreement shall state the number of shares of
Stock to which it relates.

     6.2.  Exercise  Price.  Each  Agreement  shall state the exercise price per
share of Stock.  The exercise  price per share of Stock  subject to an Incentive
Option  shall not be less than the greater of (a) the par value per share of the
Stock or (b) 100% of the Fair Market Value per share of the Stock on the date of
the grant of the  Option.  The  exercise  price per share of Stock  subject to a
Non-Incentive  Option shall be determined by the Administrator upon the granting
of the Non-Incentive Option.

     6.3.  Automatic  Options.  Notwithstanding  Paragraph 6.2, on the Effective
Date the persons then holding  unexercised  options granted pursuant to the 1990
Stock  Option Plan and Second  Amended and  Restated  Stock Option Plan of Prime
Medical  Services,   Inc.  ("Prime  Plans"),   shall  automatically  be  granted
Non-Incentive  Options  under  the Plan  covering  the same  number of shares of
Stock,  at the same  exercise  price  and for the same  term as set forth in the
options  granted  to such  persons  under  the  Prime  Plans.  The grant of such
Non-Incentive  Options shall be in  cancellation of such options granted to such
persons under the Prime Plans.

     6.4. Medium and Time of Payment, Method of Exercise, and Withholding Taxes.
The exercise price of an Option shall be payable upon the exercise of the Option
in  cash  or by  certified  or  cashier's  check  payable  to the  order  of the
Corporation (or by personal check if agreed to by the Corporation), or, with the
consent of the  Administrator,  with shares of Stock of the Corporation owned by
the Holder,  including a multiple series of exchanges of such Stock, or with the
consent of the Administrator, by a combination of cash and such shares. Exercise
of an Option shall not be effective until the  Corporation has received  written
notice of  exercise.  Such notice must  specify the number of whole shares to be
purchased and be accompanied by payment in full of the aggregate  exercise price
of the  number of shares  purchased.  The  Corporation  shall not in any case be
required to sell,  issue, or deliver a fractional share of Stock with respect to
any Option.

         The  Administrator  may, in its discretion,  require a Holder to pay to
the  Corporation  at the time of  exercise  of an Option or portion  thereof the
amount  that the  Corporation  deems  necessary  to satisfy  its  obligation  to
withhold Federal, state or local income or other taxes incurred by reason of the
exercise. Where the exercise of an Option does not give rise to an obligation to
withhold Federal income or other taxes on the date of exercise,  the Corporation
may,  in its  discretion,  require a Holder to place  shares of Stock  purchased
under the Option in escrow for the benefit of the Corporation until such time as
Federal income or other tax  withholding  is no longer  required with respect to
such shares or until such  withholding  is  required on amounts  included in the
gross  income  of the  Holder as a result  of the  exercise  of an Option or the
disposition of shares of Stock acquired  pursuant  thereto.  At such later time,
the  Corporation,  in  its  discretion,  may  require  a  Holder  to  pay to the
Corporation  the amount  that the  Corporation  deems  necessary  to satisfy its
obligation to withhold Federal, state or local income or other taxes incurred by
reason of the exercise of the Option or the disposition of shares of Stock. Upon
receipt  of such  payment  by the  Corporation,  such  shares of Stock  shall be
released from escrow to the Holder.

         6.5.  Term,  Time of  Exercise,  and  Transferability  of  Options.  In
addition to such other terms and  conditions  as may be included in a particular
Agreement  granting an Option, an Option shall be exercisable  during a Holder's
lifetime only by the Holder or by the Holder's guardian or legal representative.
Incentive  Options shall not be  transferable  other than by will or the laws of
descent and distribution.  Non-Incentive Options shall not be transferable other
than by will or the laws of descent and distribution,  or upon the express prior
written  consent of the  Administrator  in each instance.  The provisions of the
remainder of this paragraph shall apply to the extent a Holder's  Agreement does
not  expressly  provide  otherwise.  If  a  Holder  ceases  to  be  an  Eligible
Individual,  the Option shall terminate  ninety days after such Holder ceases to
be an Eligible Individual.  Notwithstanding the foregoing, if a Holder ceases to
be an Eligible  Individual  by reason of (a)  disability  (as defined in section
105(d)(4)), or (b) death, then the Holder shall have the right for twelve months
after the date of  disability  or death to exercise an Option to the extent such
Option is exercisable on the date of his disability.

         That  portion of the Option  which is not  exercisable  on the date the
Holder ceases to be an Eligible  Individual  shall terminate and be forfeited to
the Corporation on the date of such cessation.

         Notwithstanding  any other provision of this Plan, no Incentive  Option
shall be  exercisable  after the  expiration  of ten  years  from the date it is
granted,  or  the  period  specified  in  Paragraph  4.1,  if  applicable.   The
Administrator shall have authority to prescribe in any Agreement that the Option
evidenced thereby may be exercised in full or in part as to any number of shares
subject  thereto at any time or from time to time during the term of the Option,
or in such  installments at such times during said term as the Administrator may
prescribe.  Except  as  provided  above and  unless  otherwise  provided  in any
Agreement,  an Option may be  exercised  at any time or from time to time during
the term of the  Option.  Such  exercise  may be as to any or all whole  (but no
fractional) shares which have become purchasable under the Option.

         Within a reasonable  time or such time as may be permitted by law after
the Corporation  receives written notice that the Holder has elected to exercise
all or a portion of an Option,  such notice to be accompanied by payment in full
of the  aggregate  Option  exercise  price  of the  number  of  shares  of Stock
purchased,  the Corporation  shall issue and deliver a certificate  representing
the shares acquired in consequence of the exercise and any other amounts payable
in consequence of such  exercise.  In the event that a Holder  exercises both an
Incentive  Option,  or portion thereof,  and a Non-Incentive  Stock Option, or a
portion thereof,  separate Stock certificates shall be issued, one for the Stock
subject  to  the  Incentive  Option  and  one  for  the  Stock  subject  to  the
Non-Incentive  Stock Option.  The number of the shares of Stock transferable due
to an exercise of an Option  under this Plan shall not be  increased  due to the
passage of time, except as may be provided in an Agreement. However, this number
of  such  shares  of  Stock  which  are  transferable  may  increase  due to the
occurrence of certain events which are fully described in Paragraph 6.7.

         Nothing  herein or in any Option  granted  hereunder  shall require the
Corporation  to issue any shares upon  exercise  of any Option if such  issuance
would, in the opinion of counsel for the Corporation,  constitute a violation of
the Securities Act of 1933, as amended, or any similar or superseding statute or
statutes,  or any other applicable  statue or regulation,  as then in effect. At
the time of any  exercise  of an Option,  the  Corporation  may,  as a condition
precedent to the exercise of such Option,  require from the Holder of the Option
(or in the event of his death, his legal  representatives,  heirs,  legatees, or
distributees) such written  representations,  if any,  concerning his intentions
with regard to the  retention or  disposition  of the shares  being  acquired by
exercise of such Option and such written covenants and agreements, if any, as to
the  manner of  disposal  of such  shares  as, in the  opinion of counsel to the
Corporation,  may be necessary to ensure that any disposition by such Holder (or
in the  event of his  death,  his legal  representatives,  heirs,  legatees,  or
distributees),  will not involve a violation of the  Securities  Act of 1933, as
amended,  or any  similar  or  superseding  statute  or  statutes,  or any other
applicable  state  or  federal  statute  or  regulation,   as  then  in  effect.
Certificates for shares of Stock, when issued, may have the following or similar
legend, or statements of other applicable  restrictions,  endorsed thereon,  and
may not be immediately transferable:

          The  shares of Stock evidenced by this certificate have been issued to
               the  registered  owner in reliance  upon written  representations
               that these  shares  have been  purchased  for  investment.  These
               shares have not been registered under the Securities Act of 1933,
               as amended,  or any applicable state securities laws, in reliance
               upon an exception from  registration.  Without such registration,
               these shares may not be sold, transferred,  assigned or otherwise
               disposed  of unless,  in the opinion of the  Corporation  and its
               legal  counsel,  such sale,  transfer,  assignment or disposition
               will  not be in  violation  of the  Securities  Act of  1933,  as
               amended,  applicable  rules and regulations of the Securities and
               Exchange Commission, and any applicable state securities laws.

     6.6.  Limitation  on  Aggregate  Value  of  Shares  That May  Become  First
Exercisable  During Any Calendar  Year Under an Incentive  Option.  Except as is
otherwise provided in the second paragraph of Paragraph 6.7 hereof, with respect
to any Incentive Option granted under this Plan, the sum of:

     (a)  the  aggregate  Fair Market  Value of shares of Stock  subject to such
          Incentive  Option that first  become  purchasable  in a calendar  year
          under such Incentive Option, and

     (b)  the  aggregate  Fair  Market  Value of shares of Stock or stock of any
          Affiliate  (or a  predecessor  of  the  Corporation  or an  Affiliate)
          subject to any other  incentive  stock  option  (within the meaning of
          section 422A of the Code) of the  Corporation  or its Affiliates (or a
          predecessor  corporation of any such  corporation),  that first become
          purchasable in a calendar year under such  incentive  stock option may
          not (with  respect  to any  Holder)  exceed  $100,000,  with such Fair
          Market Value to be determined  as of the date the Incentive  Option or
          such other incentive stock option is granted.

For  purposes  of this  Paragraph  6.6,  "predecessor  corporation"  means (i) a
corporation that was a party to a transaction described in section 425(a) of the
Code (or which would be so described if a substitution or assumption  under such
section had been effected) with the  Corporation,  (ii) a corporation  which, at
the time the new incentive  stock option  (within the meaning of section 422A of
the Code) is  granted,  is an  Affiliate  of the  Corporation  or a  predecessor
corporation of any such corporations,  or (iii) a predecessor corporation of any
such corporations.

     6.7. Adjustments Upon Changes in Capitalization.  Notwithstanding any other
provision hereof, in the event of any change in the number of outstanding shares
of Stock effected without receipt of consideration  therefor by the Corporation,
by reason of a stock  dividend,  or split,  combination,  exchange  of shares or
other  recapitalization,  merger, or otherwise,  in which the Corporation is the
surviving corporation (1) the aggregate number and class of the reserved shares,
(2) the number and class of shares  subject to each  outstanding  Option and (3)
the exercise price of each outstanding Option shall be automatically adjusted to
equitably reflect the effect thereon of such change (provided, however, that any
fractional share resulting from such adjustment may be eliminated). In the event
of a dispute  concerning such adjustment,  the Administrator has full discretion
to determine the resolution of the dispute.  Such determination  shall be final,
binding and  conclusive.  The number of reserved  shares or the number of shares
subject to any outstanding Option shall be automatically reduced by any fraction
included  therein  which  results  from any  adjustment  made  pursuant  to this
Paragraph 6.7.

     The  following  provisions  of this  Paragraph  6.7  shall  apply  unless a
Holder's Agreement provides otherwise. In the event of:

                    (a)   a dissolution or liquidation of the Corporation,

                    (b) a merger or consolidation (other than a merger effecting
                  a re-incorporation  of the Corporation in another state or any
                  other merger or a consolidation  in which the  shareholders of
                  the surviving  corporation and their  proportionate  interests
                  therein  immediately  after the  merger or  consolidation  are
                  substantially identical to the shareholders of the Corporation
                  and their proportionate interests therein immediately prior to
                  the merger or  consolidation)  in which the Corporation is not
                  the surviving corporation (or survives only as a subsidiary of
                  another corporation in a transaction in which the shareholders
                  of the  parent  of the  Corporation  and  their  proportionate
                  interests  therein  immediately  after the transaction are not
                  substantially identical to the shareholders of the Corporation
                  and their proportionate interests therein immediately prior to
                  the transaction; provided, however, that the Administrator may
                  at any time prior to such a merger or consolidation provide by
                  resolution that the foregoing provisions of this parenthetical
                  shall not apply if a  majority  of the board of  directors  of
                  such  parent  immediately  after the  transaction  consists of
                  individuals  who  constituted  a  majority  of  the  Board  of
                  Directors immediately prior to the transaction), or

                    (c)  a  transaction  in  which  any  person  (other  than  a
                  shareholder  of the  Corporation  that already is the owner of
                  50% or more of the total combined  voting power of all classes
                  of the  Corporation  on the  date of the  Holder's  Agreement)
                  becomes the owner of 50% or more of the total combined  voting
                  power of all  classes of stock of the  Corporation  (provided,
                  however,  that the Administrator may at any time prior to such
                  transaction  provide by resolution that this  subparagraph (c)
                  shall not apply if such acquiring  person is a corporation and
                  a  majority  of  the  board  of  directors  of  the  acquiring
                  corporation  immediately  after the  transaction  consists  of
                  individuals  who  constituted  a  majority  of  the  Board  of
                  Directors  immediately prior to the acquisition of such 50% or
                  more total combined voting power)

the  Administrator  may,  at its  election,  as of the  effective  time  of such
transaction, either (1) change the number and kind of shares of stock (including
substitution of shares of another  corporation) and exercise price in the manner
it deems appropriate, provided, however, that in no event may any change be made
under this  Paragraph  6.7 which would  constitute a  "modification"  within the
meaning of section  425(h)(3) of the Code; or (2) purchase the Options from each
Holder by tendering cash equal to the Fair Market Value of the Stock represented
by the  Options  less  the  exercise  price  of the  Options  specified  in each
Agreement,   without  regard  to  the   determination  as  to  the  periods  and
installments  of  exercisability  made pursuant to a Holder's  Agreement if (and
only if) such Options have not at that time expired or been terminated.

     6.8. Rights as a Shareholder. A Holder shall have no right as a shareholder
with  respect  to  any  shares   covered  by  his  Option  until  a  certificate
representing  such  shares  is issued to him.  No  adjustment  shall be made for
dividends  (ordinary  or  extraordinary,  whether in cash or other  property) or
distributions  or other  rights for which the  record  date is prior to the date
such certificate is issued, except as provided in Paragraph 6.7 hereof.

       6.9. Modification, Extension and Renewal of Options. Subject to the terms
and conditions of and within the limitations of the Plan, the  Administrator may
modify,  extend or renew  outstanding  Options granted under the Plan, or accept
the surrender of Options  outstanding  hereunder (to the extent not  theretofore
exercised) and authorize the granting of new Options  hereunder in  substitution
therefor (to the extent not theretofore  exercised).  The Administrator may not,
however, without the consent of the Holder, modify any outstanding Options so as
to  specify  a higher or lower  exercise  price or base  amount  or  accept  the
surrender of  outstanding  Incentive  Options and  authorize the granting of new
Options in substitution therefor specifying a higher or lower exercise price. In
addition,  no modification  of an Option granted  hereunder  shall,  without the
consent  of the  Holder,  alter or impair any  rights or  obligations  under any
Option  theretofore  granted  hereunder to such Holder under the Plan, except as
may be necessary, with respect to Incentive Options, to satisfy the requirements
of section 422A of the Code.

     6.10. Furnish Information. Each Holder shall furnish to the Corporation all
information  requested  by the  Corporation  to  enable  it to  comply  with any
reporting  or other  requirement  imposed upon the  Corporation  by or under any
applicable statute or regulation.

     6.11. Obligation to Exercise; Termination of Employment. The granting of an
Option hereunder shall impose no obligation upon the Holder to exercise the same
or any part thereof.  In the event of a Holder's  termination of employment with
the Corporation or an Affiliate,  the  unexercised  portion of an Option granted
hereunder shall terminate in accordance with Paragraph 6.5 hereof.

       6.12.  Agreement  Provisions.  The Agreements  authorized  under the Plan
shall  contain  such  provisions  in  addition  to  those  required  by the Plan
(including, without limitation, restrictions or the removal of restrictions upon
the  exercise of the Option and the  retention  or  transfer  of shares  thereby
acquired)  as the  Administrator  shall deem  advisable.  Each  Agreement  shall
identify the Option evidenced  thereby as an Incentive Option or a Non-Incentive
Option,  as the case may be, and no  Agreement  shall  cover  both an  Incentive
Option and a  Non-Incentive  Option.  Each  Agreement  relating to an  Incentive
Option granted  hereunder shall contain such limitations and  restrictions  upon
the exercise of the  Incentive  Option to which it relates as shall be necessary
for the  Incentive  Option to which  such  Agreement  relates to  constitute  an
incentive stock option, as defined in section 422A of the Code.

SECTION 7.   Remedies.
- ----------   ---------

     7.1.  Attorneys Fees. The  Corporation  shall be entitled to recover from a
Holder reasonable attorneys' fees incurred in connection with the enforcement of
the terms and  provisions of the Plan and any Agreement  whether by an action to
enforce specific performance or for damages for its breach or otherwise.

     7.2. Specific Performance. The Corporation shall be entitled to enforce the
terms and  provisions  of this  Paragraph  7,  including  the remedy of specific
performance, in Travis County, Texas.

 SECTION 8.   Duration of Plan.
 ----------   -----------------

         No Options will be granted herein after the date that is ten years from
the earlier of (a) the date the Plan is accepted  by the Board of  Directors  or
(b) the date the Plan is approved by the stockholders of the Corporation.

SECTION 9.  Amendment of Plan.
- ----------  ------------------

         The Board of Directors  may at any time  terminate or from time to time
amend or suspend the Plan;  provided,  however,  that no such  amendment  shall,
without approval of the  shareholders of the Corporation,  except as provided in
Section 7 hereof,  (a)  increase the  aggregate  number of shares of Stock as to
which  Options  may be granted  under the Plan;  (b) change the  minimum  Option
exercise  price;  (c) increase the maximum  period  during which  Options may be
exercised;  or (d) extend  the  effective  period of the Plan.  No Option may be
granted during any suspension of the Plan or after the Plan has been  terminated
and no amendment,  suspension or termination shall,  without a Holder's consent,
adversely  alter or impair  any of the  rights or  obligations  under any Option
theretofore granted to such Holder under the Plan.

SECTION 10.  General.
- -----------  --------

     10.1.  Application of Funds. The proceeds  received by the Corporation from
the sale of shares  pursuant  to  Options  shall be used for  general  corporate
purposes.

     10.2.  Right of the  Corporation  and  Affiliates to Terminate  Employment.
Nothing contained in the Plan, or in any Agreement, shall confer upon any Holder
the right to  continue in the employ of the  Corporation  or any  Affiliate,  or
interfere  in any way with the rights of the  Corporation  or any  Affiliate  to
terminate his employment any time.

     10.3.  No Liability for Good Faith  Determinations.  Neither the members of
the Board of Directors nor any member of the  Administrator  shall be liable for
any act, omission,  or determination taken or made in good faith with respect to
the Plan or any Option  granted  under it, and members of the Board of Directors
and the Administrator  shall be entitled to indemnification and reimbursement by
the Corporation in respect of any claim,  loss,  damage,  or expense  (including
attorneys'  fees,  the costs of settling any suit,  provided such  settlement is
approved by independent  legal counsel selected by the Corporation,  and amounts
paid in satisfaction of a judgment,  except a judgment based on a finding of bad
faith)  arising  therefrom  to the full  extent  permitted  by law and under any
directors  and officers  liability or similar  insurance  coverage that may from
time to time be in effect.

     10.4. Information  Confidential.  As partial consideration for the granting
of each Option  hereunder,  the Agreement may, in the  Administrator's  sole and
absolute  discretion,  provide that the Holder shall agree with the  Corporation
that he  will  keep  confidential  all  information  and  knowledge  that he has
relating to the manner and amount of his  participation  in the Plan;  provided,
however,  that such  information  may be disclosed as required by law and may be
given in confidence to the Holder's spouse, tax and financial advisors,  or to a
financial institution to the extent that such information is necessary to secure
a loan.  In the event any breach of this promise  comes to the  attention of the
Administrator,  it shall take into  consideration  such breach,  in  determining
whether to recommend the grant of any future Option to such Holder,  as a factor
militating  against the  advisability of granting any such future Option to such
individual.

     10.5.  Other  Benefits.  Participation  in the Plan shall not  preclude the
Holder from eligibility in any other stock option plan of the Corporation or any
Affiliate  or  any  old  age  benefit,   insurance,   pension,  profit  sharing,
retirement,  bonus, or other extra  compensation  plans which the Corporation or
any  Affiliate  has adopted,  or may, at any time,  adopt for the benefit of its
employees.

     10.6.  Execution  of  Receipts  and  Releases.  Any  payment of cash or any
issuance  or  transfer  of  shares  of  Stock  to the  Holder,  or to his  legal
representative, heir, legatee, or distributee, in accordance with the provisions
hereof,  shall, to the extent thereof,  be in full satisfaction of all claims of
such  persons  hereunder.  The  Administrator  may  require  any  Holder,  legal
representative,  heir, legatee, or distributee, as a condition precedent to such
payment,  to execute a release  and  receipt  therefor  in such form as it shall
determine.

     10.7.  No  Guarantee  of  Interests.  Neither  the  Administrator  nor  the
Corporation gurarantees the Stock of the Corporation from loss or depreciation.

     10.8.  Payment of Expenses.  All expenses  incident to the  administration,
termination, or protection of the Plan, including, but not limited to, legal and
accounting fees,  shall be paid by the Corporation or its Affiliates;  provided,
however, the Corporation or an Affiliate may recover any and all damages,  fees,
expenses,  and/or costs arising out of any actions taken by the  Corporation  to
enforce its rights hereunder.

     10.9.  Corporation  Records.  Records of the  Corporation or its Affiliates
regarding the Holder's  period of employment,  termination of employment and the
reason therefor,  leaves of absence,  re-employment,  and other matters shall be
conclusive for all purposes hereunder, unless determined by the Administrator to
be incorrect.

     10.10. Information.  The Corporation and its Affiliates shall, upon request
or as may be specifically required hereunder,  furnish or cause to be furnished,
all of the  information or  documentation  which is necessary or required by the
Administrator to perform its duties and functions under the Plan.

     10.11. No Liability of Corporation.  The Corporation  assumes no obligation
or responsibility to the Holder or his legal  representatives,  heirs, legatees,
or  distributees  for  any  act  of,  or  failure  to act on the  part  of,  the
Administrator.

     10.12.  Corporation Action. Any action required of the Corporation shall be
by  resolution  of its Board of  Directors or by a person  authorized  to act by
resolution of the Board of Directors.

     10.13. Severability. If any provision of this Plan is held to be illegal or
invalid  for any  reason,  the  illegality  or  invalidity  shall not affect the
remaining provisions hereof, but such provision shall be fully severable and the
Plan shall be construed and enforced as if the illegal or invalid  provision had
never been included herein.

     10.14.  Notices.  Whenever any notice is required or  permitted  hereunder,
such notice must be in writing and personally  delivered or sent by mail or by a
nationally  recognized  courier service.  Any notice required or permitted to be
delivered  hereunder  shall be deemed to be delivered on the date on which it is
personally  delivered,  or, if mailed,  whether actually received or not, on the
third business day after it is deposited in the United States mail, certified or
registered, postage prepaid, addressed to the person who is to receive it at the
address which such person has previously  specified by written notice  delivered
in accordance  herewith or, if by courier,  twenty-four  hours after it is sent,
addressed as described in this Section.  The Corporation or a Holder may change,
at any time and from time to time, by written  notice to the other,  the address
which it or he had previously specified for receiving notices.  Until changed in
accordance  herewith,  the  Corporation and each Holder shall specify as its and
his  address  for  receiving  notices  the  address  set forth in the  Agreement
pertaining to the shares to which such notice relates.

     10.15.  Waiver of Notice. Any person entitled to notice hereunder may waive
such notice.

     10.16.  Successors.  The Plan shall be binding  upon the Holder,  his legal
representatives,  heirs,  legatees and distributees  upon the  Corporation,  its
successors, and assigns, and upon the Administrator, and its successors.

     10.17.  Headings.  The titles and headings of Sections and  Paragraphs  are
included for  convenience  of  reference  only and are not to be  considered  in
construction of the provisions hereof.

     10.18.  Governing Law. All questions arising with respect to the provisions
of the Plan shall be determined by application of the laws of the State of Texas
except to the extent Texas law is preempted  by federal law.  Questions  arising
with respect to the  provisions of an Agreement that are matters of contract law
shall be governed by the laws of the state specified in the Agreement, except to
the  extent  preempted  by  federal  law and  except to the  extent  that  Texas
corporate  law  conflicts  with the contract  law of such state,  in which event
Texas corporate law shall govern.  The obligation of the Corporation to sell and
deliver Stock hereunder is subject to applicable laws and to the approval of any
governmental authority required in connection with the authorization,  issuance,
sale, or delivery of such Stock.

     10.19. Word Usage.  Words used in the masculine shall apply to the feminine
where  applicable,  and wherever the context of this Plan  dictates,  the plural
shall be read as the singular and the singular as the plural.

         IN WITNESS WHEREOF, Prime Medical Services, Inc., acting by and through
its officer  hereunto duly  authorized,  has executed this Plan on this the 12th
day of October, 1993.

                                      PRIME MEDICAL SERVICES, INC.


                                      By:/s/ Kenneth S. Shifrin
                                         -------------------------
                                         Kenneth S. Shifrin
                                         Chairman of the Board and Director






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