Document:

EXECUTIVE EMPLOYMENT AGREEMENT

         This Employment  Agreement  (this  "Agreement") is by and between Prime
Medical Services, Inc., a Delaware corporation ("Employer") and Cheryl Williams,
an individual ("Executive"), and shall be effective as of September 1, 2000 (the
"Effective Date").

                             Preliminary Statements

         Executive  desires  to be  employed  by  Employer  upon the  terms  and
conditions  stated herein,  and Employer  desires to employ  Executive  provided
that,  in so doing,  it can  protect  its  confidential  information,  business,
accounts, patronage and goodwill.

         Employer and Executive have  specifically  determined that the terms of
this Agreement are fair and reasonable.

                             Statement of Agreement

         NOW,  THEREFORE,  in consideration of the premises and mutual covenants
contained herein, and for other good,  valuable and binding  consideration,  the
receipt and  sufficiency of which are hereby  acknowledged,  the parties hereto,
intending to be legally bound hereby, agree as follows:

                                   ARTICLE I.

                      Term; Termination; Prior Agreements.

     Section 1.1 Term.  Employer  hereby hires  Executive and Executive  accepts
such employment for a term of one year commencing on the Effective Date.

         Section 1.2 Termination Upon Expiration.  Unless earlier  terminated by
Employer  or  Executive  in  accordance  with the terms of this  Agreement,  and
subject to any  extension  of the term of this  Agreement  pursuant  to the last
sentence of Section 1.5, this Agreement shall terminate  automatically  upon the
expiration of the one-year term described in Section 1.1.

         Section  1.3  Termination  Upon  Death or  Permanent  Disability.  This
Agreement shall be automatically  terminated on the death of Executive or on the
permanent  disability  of Executive if Executive is no longer able to perform in
all material  respects the usual and customary duties of Executive's  employment
hereunder.  For purposes hereof, any condition which in reasonable likelihood is
expected to impair Executive's  ability to materially perform Executive's duties
hereunder  for a period  of three  months  or more  shall  be  considered  to be
permanent.

         Section  1.4  Termination  for Cause.  If this  Agreement  has not been
previously  terminated,  and no party has previously given notice of termination
pursuant to Section 1.5, Section 1.6 or Section 1.7, then Employer may terminate
this Agreement "for cause" if:

     (a) In connection with the business of Employer,  Executive is convicted of
an offense constituting a felony or involving moral turpitude; or

                  (b) in a material  and  substantial  way,  (i)  Executive  (A)
violates  any written  policy of Employer,  (B)  violates any  provision of this
Agreement,  (C) fails to follow  reasonable  written  instructions or directions
from the Board of  Directors  of Employer  (the  "Board"),  or any other  person
authorized by the Board to instruct or supervise Executive (for purposes of this
Agreement,  any such  authorized  person is referred to as an "Authorized  Board
Designee"),  or (D) fails to use  good-faith  efforts  to perform  the  services
required pursuant to this Agreement; and (ii) Executive fails to materially cure
such  violation or failure within  fifteen days after  receiving  written notice
from the Board clearly  specifying  the act or  circumstances  that gave rise to
such violation or failure.

         A notice of  termination  pursuant to this Section  shall be in writing
and shall state the alleged reason for termination.  Executive,  within not less
than  fifteen nor more than thirty  days after such  notice,  shall be given the
opportunity  to appear  before the Board,  or a committee  thereof,  to rebut or
dispute  the  alleged  reason  for  termination.   If  the  Board  or  committee
determines,  by a majority of the  disinterested  directors,  after having given
Executive the opportunity to rebut or dispute the allegations,  that such reason
is indeed valid, Employer may immediately terminate Executive's employment under
this Agreement for cause.  Immediately  upon giving the notice  contemplated  by
this  paragraph,  Employer may elect,  during the pendency of such  inquiry,  to
relieve Executive of Executive's regular duties.

         Section 1.5 Termination  for Good Reason.  Any termination by Executive
of this  Agreement  pursuant to this Section  shall be deemed a  termination  by
Executive for "good  reason".  Executive may terminate  this  Agreement for good
reason  any  time  after a  Change  of  Control  in  accordance  with any of the
following  (with the further  agreement  that any  election by  Executive to not
terminate this Agreement  pursuant to this Section following a particular Change
of Control  shall not prevent the  application  of this  Section to a subsequent
Change of Control):

                  (a)  Executive  may  terminate  this  Agreement  for any or no
reason upon six months prior written notice, which notice cannot be given before
the  consummation  of such Change of Control or after the expiration of the term
of this Agreement pursuant to Section 1.1;

     (b) Executive may terminate  this  Agreement upon thirty days prior written
notice if Executive's base salary, as provided hereunder, is diminished;

                  (c) Executive may terminate  this  Agreement  upon thirty days
prior written  notice if Employer  requires that  Executive move to a city other
than Austin;

                  (d) Executive may terminate  this  Agreement  upon thirty days
prior written  notice if the Board or any Authorized  Board Designee  materially
and unreasonably  interferes with Executive's ability to fulfill Executive's job
duties; or

                  (e) Executive may terminate  this  Agreement  upon thirty days
prior written  notice if Executive is  reassigned to a position with  diminished
responsibilities, or Executive's job responsibilities are materially narrowed or
diminished.

         Without limiting the provisions of Section 1.8 hereof, Executive agrees
that Employer can relieve Executive of Executive's duties hereunder prior to the
end of the applicable  notice period  provided for in this Section,  and in such
event,  Executive  shall not  thereafter  be entitled to any of the  benefits or
salary described in Article III hereof.

         If Employer does not relieve Executive of Executive's duties during any
applicable  notice period under this Section,  and the applicable  notice period
extends beyond the expiration of the term of this Agreement  pursuant to Section
1.2, then the terms and  provisions of this Agreement  shall govern  Executive's
employment by Employer until the end of such notice period, and the term of this
Agreement  shall be deemed  automatically  extended until the end of such notice
period.

         Section  1.6  Termination  of  Agreement  by  Employer  Without  Cause.
Employer has the right to terminate this  Agreement,  other than "for cause," on
30 days prior written  notice.  Any  termination  of this  Agreement by Employer
other than pursuant to the express terms of Section 1.2,  Section 1.3 or Section
1.4 shall be deemed a  termination  pursuant to this  Section,  irrespective  of
whether the notice required under this Section is properly given.

         Section 1.7 Termination of Agreement by Executive  Without Good Reason.
Executive may terminate  Executive's  employment,  other than for "good reason,"
upon 30 days prior  written  notice  stating that this  Agreement is  terminated
other  than for "good  reason".  Executive  agrees  that  Employer  can  relieve
Executive of Executive's duties hereunder prior to the end of such 30 day notice
period, and in such event,  Executive shall not thereafter be entitled to any of
the benefits or salary described in Article III hereof.

     Section 1.8 Executive's  Rights Upon Termination.  Upon termination of this
Agreement, Executive shall be entitled to the following:

                  (a) If this  Agreement is terminated  pursuant to Section 1.2,
Section 1.3,  Section 1.4, or Section 1.7 then  Employer  shall pay Executive or
Executive's  representative,  as the case may be, Executive's  then-current base
salary (excluding any bonuses and non-cash  benefits) through the effective date
of termination  (which,  in the case of Section 1.7, shall follow any portion of
the  applicable  notice period  during which  Executive has not been relieved of
Executive's  duties hereunder),  and Employer shall have no further  obligations
hereunder.

                  (b)  If  Employer  terminates  this  Agreement  without  cause
pursuant to Section 1.6 or otherwise,  or Executive  terminates  this  Agreement
pursuant to Section 1.5, then, in addition to receiving Executive's then current
base salary  through the  effective  date of  termination,  Executive  (i) shall
receive within 15 days of the effective  date of termination a lump-sum  payment
equal to to the greater of (A) Executive's then current  annualized base salary,
or (B) $150,000,  and (ii) unless the termination  was by Executive  pursuant to
Section  1.5(a),   shall  be  released  from  the  provisions  of  Section  4.2,
notwithstanding  that the  provisions  of such Section would  otherwise  survive
termination  of this Agreement  pursuant to Section 1.9.  Executive and Employer
agree that the effective date of any  termination  pursuant to Section 1.5 shall
be the earlier of the end of the  applicable  notice period or the date on which
Employer  relieves  Executive of  Executive's  duties  hereunder.  Executive and
Employer  agree that the effective date of any  termination  pursuant to Section
1.6  hereof  shall  be only  upon the  expiration  of the 30 day  notice  period
described  in Section  1.6,  regardless  of whether  Employer  earlier  relieves
Executive of Executive's duties hereunder.

         Section 1.9 Survival; No Effect on Deferred Compensation  Arrangements.
Any termination of this Agreement and Executive's employment as a result thereof
shall not release either Employer or Executive from their respective obligations
to the date of termination  nor from the provisions of this Agreement  which, by
necessary or reasonable implication,  are intended to apply after termination of
this Agreement,  including,  without  limitation,  the provisions of Article IV.
Furthermore,  neither the  termination of this Agreement nor the  termination of
Executive's  employment  under this Agreement shall affect,  limit, or modify in
any manner the  existence or  enforceability  of any written  agreement  between
Executive  and Employer  related to or providing  for deferred  compensation  of
Executive (or any similar written arrangement).

         Section  1.10   Termination  of  Existing   Agreements.   Any  previous
employment  agreement  between  Executive on the one hand and Employer or any of
Employer's  Affiliates  (as  hereinafter  defined)  on the other  hand is hereby
terminated.

     Section 1.11 "Change of  Control."  As used in this  Agreement,  "Change of
Control" shall mean the occurrence of any of the following:

                  (a) Any  person,  entity or "group"  within the meaning of ss.
13(d) or 14(d) of the of the  Securities and Exchange Act of 1934 (the "Exchange
Act") becomes the beneficial owner (within the meaning of Rule 13d-3 promulgated
under the  Exchange  Act) of more than 50% of the  combined  voting power of the
then outstanding voting securities entitled to vote generally in the election of
the Board;

                  (b)  a  merger,   reorganization   or  consolidation   whereby
Employer's   equity  holders   existing   immediately   prior  to  such  merger,
reorganization or consolidation do not,  immediately after  consummation of such
reorganization,  merger  or  consolidation,  own more  than 50% of the  combined
voting  power of the  surviving  entity's  then  outstanding  voting  securities
entitled to vote generally in the election of directors;

                  (c) the sale of all or substantially  all of Employer's assets
to an entity in which Employer, any subsidiary of Employer, or Employer's equity
holders existing  immediately  prior to such sale beneficially own less than 50%
of the combined voting power of such acquiring  entity's then outstanding voting
securities entitled to vote generally in the election of directors; or

                  (d) any change in the  identity of  directors  constituting  a
majority of the Board within a  twenty-four  month period  unless the change was
approved by a majority of the Incumbent  Directors,  where "Incumbent  Director"
means a  member  of the  Board  at the  beginning  of the  period  in  question,
including  any  director  who was not a member of the Board at the  beginning of
such  period  but  was  elected  or  nominated  to  the  Board  by,  or  on  the
recommendation  of or with the approval of, at least two-thirds of the directors
who then qualified as Incumbent Directors.

                                   ARTICLE II.

                               Duties of Executive

         Subject to the approvals by and the ultimate  supervision  of the Board
and each Authorized Board Designee, Executive during the term hereof shall serve
as the Chief  Financial  Officer.  Subject  to the  control of the Board and any
Authorized   Board   Designee,   Executive   shall  have  the   responsibilities
commensurate  with  Executive's  title and as otherwise  provided in  Employer's
bylaws and other governing  documents,  but in any event,  construed in a manner
generally  consistent  with  the  responsibilities  of  Executive  that  existed
immediately prior to the Effective Date.

         During the  period of  employment  hereunder,  Executive  shall  devote
substantially  Executive's  entire  time and best  efforts  to the  business  of
Employer for the profit,  benefit and  advantage of Employer,  and shall perform
such other services as shall be  designated,  from time to time, by the Board or
any Authorized Board Designee; provided, however, that this Section shall not be
construed as preventing Executive from investing  Executive's personal assets in
business ventures that do not compete with Employer or Employer's Affiliates (as
hereinafter  defined) or are not  otherwise  prohibited by this  Agreement,  and
spending  reasonable  amounts  of  personal  time  in  the  management  thereof.
Executive  shall use  Executive's  best  efforts to  promote  the  interests  of
Employer and Employer's Affiliates,  and to preserve their goodwill with respect
to their  employees,  customers,  suppliers  and other persons  having  business
relations  with Employer.  Executive  agrees to accept and hold all such offices
and/or  directorships  with  Employer  and  Employer's  Affiliates  as to  which
Executive  may, from time to time, be elected.  For purposes of this  Agreement,
Employer's subsidiaries,  parent companies and other affiliates are collectively
referred to as "Affiliates."

                                  ARTICLE III.

                         Salary; Expense Reimbursements

         Section 3.1 Salary.  As compensation for Executive's  service under and
during  the  term  of  this  Agreement  (or  until  terminated  pursuant  to the
provisions hereof) Employer shall pay Executive a salary of $12,500 per calendar
month  (prorated for partial  months),  payable in  accordance  with the regular
payroll practices of Employer, as in effect from time to time. Such salary shall
be subject to withholding for the prescribed federal income tax, social security
and  other  items  as  required  by law  and for  other  items  consistent  with
Employer's  policy with respect to health  insurance and other benefit plans for
similarly  situated  employees  of  Employer  in which  Executive  may  elect to
participate.

         Section  3.2  Other  Benefits.  During  the  term  of  this  Agreement,
Executive also shall be entitled to the same amount of paid vacation per year as
was  available to Executive and other senior  management  executives of Employer
under the policy of Employer in effect on the Effective Date. Executive will not
be paid for unused  vacation,  and unused  vacation cannot be carried forward to
subsequent years.  Without limiting the foregoing,  Executive shall also receive
such paid sick leave,  insurance and other fringe benefits as are generally made
available  to  other  personnel  of  Employer  in  comparable  positions,   with
comparable service credit and with comparable duties and  responsibilities.  Any
benefits in excess of those granted other  salaried  employees of Employer shall
be subject to the prior  approval of the Board.  Notwithstanding  the foregoing,
(a) Executive  shall be entitled to participate in Employer's  annual  Executive
Incentive  Compensation  Pool  which  is  allocated  to  participants  based  on
individual  and  company  wide  goal  attainment,  as  determined  in  the  sole
discretion of the Board,  and (b) Executive shall be eligible for  participation
in Employer's Stock Option Plan (if any), but all option grants thereunder shall
be subject to the sole discretion of the Board.

         Section  3.3  Bonuses.  In the  discretion  of the Board,  and  without
implying  any  obligation  on  Employer  ever to  award a  bonus  to  Executive,
Executive  may from time to time be awarded a cash bonus or bonuses for services
rendered  to  Employer  during  the term of  Executive's  employment  under this
Agreement.  If and to the extent a bonus is ever considered for Executive, it is
expected  that any such bonus will be based not only on  Executive's  individual
performance   and   Executive's   relative   position,    service   tenure   and
responsibilities with Employer, but also on the performance and profitability of
the entire business of Employer.

         Section  3.4  Expenses.   Employer   shall   reimburse  all  reasonable
out-of-pocket  travel and business  expenses incurred by Executive in connection
with the performance of Executive's duties pursuant to this Agreement. Executive
shall provide  Employer with  documentation of Executive's  expenses,  in a form
acceptable  to  Employer  and which  satisfies  applicable  federal  income  tax
reporting and record keeping requirements.

         Section 3.5 Location of Employment.  The parties  acknowledge and agree
that Executive's  employment duties hereunder are performable in Austin,  Texas,
subject to business travel commensurate with Executive's duties hereunder and as
otherwise requested by Employer.

                                   ARTICLE IV.

                        Executive's Restrictive Covenants

         Section 4.1  Confidentiality  Agreement.  Executive  acknowledges  that
Executive has been and will continue to be exposed to  confidential  information
and trade secrets  ("Proprietary  Information")  pertaining to, or arising from,
the business of Employer and/or  Employer's  Affiliates,  that such  Proprietary
Information  is  unique  and  valuable  and  that  Employer  and/or   Employer's
Affiliates would suffer  irreparable injury if this information were divulged to
those  in  competition  with  Employer  or  Employer's  Affiliates.   Therefore,
Executive agrees to keep in strict secrecy and confidence, both during and after
the period of Executive's  employment,  any and all information  which Executive
acquires,  or to which Executive has access,  during  Executive's  employment by
Employer,  that  has not been  publicly  disclosed  by  Employer  or  Employer's
Affiliates,  that is not a  matter  of  common  knowledge  by  their  respective
competitors or that is not required to be disclosed  through legal process.  The
Proprietary  Information covered by this Agreement shall include,  but shall not
be limited to,  information  relating to any  inventions,  processes,  software,
formulae, plans, devices,  compilations of information,  technical data, mailing
lists, management strategies,  business distribution methods, names of suppliers
(of both goods and  services)  and  customers,  names of employees  and terms of
employment,  arrangements entered into with suppliers and customers,  including,
but not limited to, proposed  expansion  plans of Employer,  marketing and other
business and pricing strategies, and trade secrets of Employer and/or Employer's
Affiliates.

         Except  with  prior  approval  of the  Board  or any  Authorized  Board
Designee,  Executive  will not,  either during or after  Executive's  employment
hereunder:  (a) directly or indirectly  disclose any Proprietary  Information to
any person except  authorized  personnel of Employer;  nor, (b) use  Proprietary
Information in any manner other than in furtherance of the business of Employer.
Upon  termination  of  employment,  whether  voluntary  or  involuntary,  within
forty-eight  hours of termination,  Executive will deliver to Employer  (without
retaining  copies  thereof)  all  documents,  records or other  memorializations
including  copies of documents and any notes which Executive has prepared,  that
contain   Proprietary   Information   or  relate  to  Employer's  or  Employer's
Affiliates' business, all other tangible Proprietary  Information in Executive's
possession or control,  and all of Employer's and the Affiliates'  credit cards,
keys, equipment,  vehicles,  supplies and other materials that are in possession
or under Executive's control.

         Section 4.2 Nonsolicitation  Agreement.  During Executive's  employment
hereunder and for a period of one year after Executive  ceases to be employed by
Employer,  Executive  shall not,  directly or indirectly,  for  Executive's  own
account or otherwise (i) solicit business from, divert business from, or attempt
to convert to other methods of using the same or similar products or services as
provided by Employer or Employer's  Affiliates,  any client, account or location
of Employer or Employer's Affiliates with which Executive has had any contact as
a result of Executive's employment hereunder;  or (ii) solicit for employment or
employ any employee or former employee of Employer or Employer's Affiliates.

         Section 4.3 Remedies. Executive understands and acknowledges damages at
law alone will be an  insufficient  remedy for Employer and Employer will suffer
irreparable   injury  if  Executive   violates  the  terms  of  this  Agreement.
Accordingly,  Employer,  upon application to a court of competent  jurisdiction,
shall be  entitled  to  injunctive  relief to  enforce  the  provisions  of this
Agreement  in the event of any  breach,  or  threatened  breach,  of its  terms.
Executive  hereby  waives  any  requirement  that  Employer  post  bond or other
security prior to obtaining such  injunctive  relief.  Injunctive  relief may be
sought in addition to any other  available  rights or remedies at law.  Employer
shall  additionally  be  entitled  to  reasonable  attorneys'  fees  incurred in
enforcing the provisions of this Agreement.

                                   ARTICLE V.

                                  Miscellaneous

         Section  5.1  Assignment.  No party to this  Agreement  may assign this
Agreement or any or all of its rights or  obligations  hereunder  without  first
obtaining the written  consent of all other parties  hereto.  Any  assignment in
violation  of the  foregoing  shall be null and void.  Subject to the  preceding
sentences of this  Section,  the terms and  conditions of this  Agreement  shall
inure to the  benefit  of and be  binding  upon the  parties  hereto  and  their
respective heirs, legal representatives,  successors and permitted assigns. This
Agreement  shall not be deemed to  confer  upon any  person  not a party to this
Agreement any rights or remedies  hereunder.  The  provisions of this Section do
not preclude the sale,  transfer or assignment of the ownership interests of any
entity  that is a party to this  Agreement,  although  such a sale,  transfer or
assignment  may  be  expressly  prohibited  or  conditioned  pursuant  to  other
provisions of this Agreement.

     Section 5.2 Amendments. This Agreement cannot be modified or amended except
by a written agreement executed by all parties hereto.

         Section 5.3 Waiver of Provisions;  Remedies  Cumulative.  Any waiver of
any term or condition of this Agreement must be in writing, and signed by all of
the parties  hereto.  The waiver of any term or  condition  hereof  shall not be
construed  as either a  continuing  waiver with respect to the term or condition
waived, or a waiver of any other term or condition hereof. No party hereto shall
by any act  (except by written  instrument  pursuant  to this  Section),  delay,
indulgence,  omission or  otherwise  be deemed to have waived any right,  power,
privilege or remedy  hereunder or to have acquiesced in any default in or breach
of any of the terms and conditions hereof. No failure to exercise, nor any delay
in exercising,  on the part of any party hereto, any right, power,  privilege or
remedy  hereunder  shall  operate  as a waiver  thereof.  No single  or  partial
exercise of any right,  power,  privilege or remedy hereunder shall preclude any
other or further  exercise  thereof or the exercise of any other  right,  power,
privilege  or  remedy.  No  remedy  set  forth in this  Agreement  or  otherwise
conferred  upon or reserved to any party shall be  considered  exclusive  of any
other remedy  available to any party,  but the same shall be distinct,  separate
and  cumulative  and may be exercised from time to time as often as occasion may
arise or as may be deemed expedient.

         Section  5.4  Further  Assurances.  At and from time to time  after the
Closing,  each party shall, at the request of another party hereto,  but without
further consideration,  execute and deliver such other instruments and take such
other actions as the requesting  party may  reasonably  request in order to more
effectively  evidence or consummate the transactions or activities  contemplated
hereunder.

         Section  5.5  Entire  Agreement.  This  Agreement  and  the  agreements
contemplated hereby or executed in connection herewith (a) constitute the entire
agreement of the parties hereto  regarding the subject  matter  hereof,  and (b)
supersede all prior agreements and understandings,  both written and oral, among
the parties hereto, or any of them, with respect to the subject matter hereof.

         Section 5.6 Severability; Illegality. In the event any state or federal
laws or  regulations,  now  existing  or enacted or  promulgated  after the date
hereof,  are  interpreted  by judicial  decision,  a regulatory  agency or legal
counsel  in such a manner  as to  indicate  that  any  provision  hereof  may be
illegal,  invalid or unenforceable,  such provision shall be fully severable and
this  Agreement  shall be construed and enforced as if such illegal,  invalid or
unenforceable  provision  never  comprised  a part  hereof;  and  the  remaining
provisions  hereof  shall  remain  in full  force  and  effect  and shall not be
affected by the illegal,  invalid or unenforceable provision or by its severance
herefrom.  Furthermore,  in lieu  of  such  illegal,  invalid  or  unenforceable
provision,  there  shall  be added  automatically  as part of this  Agreement  a
provision that (a) preserves the underlying economic and financial  arrangements
between  the  parties  hereto  without  substantial  economic  detriment  to any
particular  party and (b) is as  similar in effect to such  illegal,  invalid or
unenforceable  provision as may be possible and be legal, valid and enforceable.
No party to this Agreement shall claim or assert  illegality as a defense to the
enforcement  of this  Agreement  or any  provision  hereof;  instead,  any  such
purported illegality shall be resolved pursuant to the terms of this Section.

         Section  5.7  GOVERNING   LAW.  THIS   AGREEMENT  AND  THE  RIGHTS  AND
OBLIGATIONS  OF THE  PARTIES  HERETO  SHALL BE  GOVERNED  BY AND  CONSTRUED  AND
ENFORCED IN ACCORDANCE  WITH THE  SUBSTANTIVE  LAWS (BUT NOT THE RULES GOVERNING
CONFLICTS OF LAWS) OF THE STATE OF TEXAS.

         Section 5.8 Language  Construction.  This Agreement shall be construed,
in all cases,  according to its fair meaning, and without regard to the identity
of the person who drafted the various  provisions  contained herein. The parties
acknowledge  that each party and its counsel  have  reviewed  and  revised  this
Agreement  and that the  normal  rule of  construction  to the  effect  that any
ambiguities are to be resolved  against the drafting party shall not be employed
in the interpretation hereof. As used in this Agreement,  "day" or "days" refers
to  calendar  days  unless  otherwise  expressly  stated in each  instance.  The
captions in this  Agreement are for  convenience of reference only and shall not
limit or  otherwise  affect  any of the  terms or  provisions  hereof.  When the
context  requires,  the  gender of all  words  used  herein  shall  include  the
masculine,  feminine  and neuter and the number of all words  shall  include the
singular and plural. Use of the words "herein", "hereof", "hereto",  "hereunder"
and the  like  in this  Agreement  shall  be  construed  as  references  to this
Agreement as a whole and not to any particular Article,  Section or provision of
this Agreement, unless otherwise expressly noted.

         Section 5.9 Notice.  Whenever  this  Agreement  requires or permits any
notice,  request, or demand from one party to another,  the notice,  request, or
demand must be in writing to be  effective  and shall be deemed to be  delivered
and received (a) if personally delivered or if delivered by facsimile or courier
service,  when  actually  received by the party to whom notice is sent or (b) if
delivered by mail (whether  actually  received or not), at the close of business
on the  third  business  day next  following  the day when  placed  in the mail,
postage prepaid, certified or registered,  addressed to the appropriate party or
parties,  at the address of such party set forth below (or at such other address
as such party may designate by written notice to all other parties in accordance
herewith):

     If to Employer:                     Prime Medical Services, Inc.
                                         1301 Capital of Texas Hwy, Suite C-300
                                         Austin, TX  78746
                                         Attention:  Board of Directors
                                         Facsimile Transmission:  (512) 314-4503

     If to Executive:                    Cheryl Williams
                                         13922 Lone Rider Trail
                                         Austin, TX  78736
                                         Facsimile Transmission:  (512) 263-1411

         Section 5.10 CHOICE OF FORUM; ATTORNEYS' FEES. THE PARTIES HERETO AGREE
THAT THIS AGREEMENT IS PERFORMABLE IN WHOLE AND IN PART IN TRAVIS COUNTY, TEXAS,
AND SHOULD ANY SUIT,  ACTION OR  PROCEEDING  ARISING  OUT OF THIS  AGREEMENT  BE
INSTITUTED  BY ANY PARTY  HERETO  (OTHER THAN A SUIT,  ACTION OR  PROCEEDING  TO
ENFORCE OR REALIZE UPON ANY FINAL COURT JUDGMENT ARISING OUT OF THIS AGREEMENT),
SUCH SUIT,  ACTION OR PROCEEDING  SHALL BE INSTITUTED ONLY IN A STATE OR FEDERAL
COURT IN TRAVIS COUNTY,  TEXAS.  EACH OF THE PARTIES  HERETO  CONSENTS TO THE IN
PERSONAM  JURISDICTION OF ANY STATE OR FEDERAL COURT IN TRAVIS COUNTY, TEXAS AND
WAIVES ANY OBJECTION TO THE VENUE OF ANY SUCH SUIT,  ACTION OR  PROCEEDING.  THE
PARTIES HERETO RECOGNIZE THAT COURTS OUTSIDE TRAVIS COUNTY,  TEXAS MAY ALSO HAVE
JURISDICTION OVER SUITS,  ACTIONS OR PROCEEDINGS  ARISING OUT OF THIS AGREEMENT,
AND IN THE EVENT THAT ANY PARTY  HERETO SHALL  INSTITUTE A PROCEEDING  INVOLVING
THIS  AGREEMENT  IN A  JURISDICTION  OUTSIDE  TRAVIS  COUNTY,  TEXAS,  THE PARTY
INSTITUTING  SUCH  PROCEEDING  SHALL  INDEMNIFY  ANY OTHER PARTY  HERETO FOR ANY
LOSSES AND EXPENSES THAT MAY RESULT FROM THE BREACH OF THE FOREGOING COVENANT TO
INSTITUTE  SUCH  PROCEEDING  ONLY IN A STATE OR FEDERAL COURT IN TRAVIS  COUNTY,
TEXAS, INCLUDING WITHOUT LIMITATION ANY ADDITIONAL EXPENSES INCURRED AS A RESULT
OF LITIGATING IN ANOTHER  JURISDICTION,  SUCH AS REASONABLE FEES AND EXPENSES OF
LOCAL COUNSEL AND TRAVEL AND LODGING  EXPENSES FOR PARTIES,  WITNESSES,  EXPERTS
AND SUPPORT  PERSONNEL.  THE PREVAILING PARTY IN ANY ACTION TO ENFORCE OR DEFEND
RIGHTS  UNDER  THIS  AGREEMENT  SHALL BE  ENTITLED  TO  RECOVER  ITS  COSTS  AND
REASONABLE ATTORNEYS' FEES IN ADDITION TO ANY OTHER RELIEF GRANTED.

     Section  5.11  Counterparts.  This  Agreement  may be  executed in multiple
counterparts,  each of  which  shall be  deemed  an  original,  and all of which
together shall constitute one and the same instrument.

                            [Signature page follows]

<PAGE>

S-1

                                SIGNATURE PAGE TO

                         EXECUTIVE EMPLOYMENT AGREEMENT

         EXECUTED by Employer and  Executive to be effective for all purposes as
of the Effective Date provided above.

EMPLOYER:                                    PRIME MEDICAL SERVICES, INC.

                           Brad  A.  Hummel,   President  and  Chief   Executive
                                               Officer

EXECUTIVE:

                           Printed Name: Cheryl WilliamsNON-COMPETITION, RELEASE AND SEVERANCE AGREEMENT

         This   Non-Competition,   Release   and   Severance   Agreement   (this
"Agreement"),  dated as of December 29, 2000,  is by and between  Prime  Medical
Services,  Inc., a Delaware  corporation  (the  "Company"),  and Joseph Jenkins,
M.D., an individual ("Employee").

                             PRELIMINARY STATEMENTS

         WHEREAS,  the Company has employed  Employee as an executive officer of
the Company,  most recently pursuant to a certain written  Employment  Agreement
(as amended to date, the "Employment Agreement"); and

         WHEREAS,  the  Company  and  Employee  have  agreed  to  terminate  the
employment  relationship  and the  Employment  Agreement,  for  each to  provide
certain  releases of liability to the other (the "Releases") and for Employee to
be paid certain fees in  consideration  for entering  into and  performing  this
Agreement.

                             STATEMENT OF AGREEMENT

         NOW,  THEREFORE,  in consideration of the premises and mutual covenants
contained  herein and for other good,  valuable and binding  consideration,  the
receipt and  sufficiency of which are hereby  acknowledged,  the parties hereto,
intending to be legally bound hereby, agree as follows:

I.       SEVERANCE OF RELATIONSHIP

         Employee  hereby  resigns  from  any and all  offices,  positions,  and
responsibilities  with the Company  and any of the  Company's  subsidiaries  and
affiliates (collectively,  including the Company and any future subsidiaries and
affiliates of the Company  created,  acquired or otherwise  existing  during the
term  hereof,  the  "Affiliated  Entities"),  including,  but  not  limited  to,
Employee's  position as Vice Chairman of the Company and all positions as agent,
employee,  director or officer of any Affiliated Entity, which Employee may hold
or claim to hold, and the Company accepts such resignation.  Notwithstanding the
foregoing,  Employee  does not resign his position as a member of the  Company's
Board of Directors,  though  Employee and the Company agree that Employee has no
contractual  right or obligation  to remain on such Board and may resign,  or be
removed or replaced, in accordance with the Company's organizational documents.

         Employee and the Company further  acknowledge and agree that Employee's
relationship  with each of the Affiliated  Entities is hereby terminated for all
purposes.  The parties agree that the Employment  Agreement is hereby terminated
in  all  respects  and  that  no  further  payments  to  Employee  shall  be due
thereunder. Employee agrees, however, subject to his reasonable availability, to
assist  the  Company  in   completing   an  orderly   transition  of  Employee's
responsibilities  and duties  following  termination of  employment,  including,
without  limitation,  (a) assisting  the Company with any  litigation or similar
proceedings  involving the Company or an Affiliated  Entity, (b) promptly making
any  introductions  requested  by the  Company  or any  of its  officers  to any
individual  (or the  principals,  representatives  or agents of any entity) that
Employee dealt with in marketing or developing  business  opportunities  for the
Company,  any  Affiliated  Entity or the  products and services of either of the
foregoing.  Employee agrees to undertake the  responsibilities  described in the
preceding sentence in good faith with the best interests of the Company in mind.
The  parties  agree  that,  except as may  otherwise  be agreed  upon in writing
between them, the foregoing  transitional  support by Employee will, except with
respect to litigation or similar  proceedings,  require no more than ninety (90)
days after the date hereof to complete.  With respect to litigation  and similar
proceedings,  Employee  agrees to assist the Company  with  respect to the South
Carolina II litigation, the Graves/Ash litigation, the Driber litigation and any
future  litigation  in which the  Employee's  knowledge  of  relevant  facts and
circumstances  can reasonably be expected to be helpful to the Company,  subject
to Employee's  reasonable  availability.  The Company agrees to pay or reimburse
Employee's reasonable travel,  lodging and other out-of-pocket expenses incurred
in assisting the Company in these  transitional and litigation related services;
provided  the Company  must  approve  all such  expenses  that exceed  $1,000 in
advance of their incurrence.  As used herein, the term "reasonable availability"
contemplates   that  the  Employee's  time,   energy,   and  attention  will  be
substantially  reduced  ninety  (90) days  after the date  hereof,  and that his
availability  thereafter  will be influenced by his pursuit of other business or
personal  activities,  making his availability by telephone,  facsimile or other
electronic  means more  necessary.  The parties  acknowledge  and agree that the
Company has certain  indemnity  obligations  to Employee under and pursuant to a
certain  Indemnity  Agreement  dated June 12,  1996,  which shall  survive  this
Agreement  as  part  of  the  Surviving  Contracts  (as  hereinafter   defined).
Furthermore,  for so long as Employee remains a member of the Board of Directors
of the Company, he will be entitled to compensation and expense reimbursement as
is accorded all  non-employee  members of the  Company's  Board  pursuant to the
Company's  policy as in  effective  from time to time.  As  necessary  to assist
Employee  in  fulfilling  these  responsibilities,  the  Company  agrees to make
available  Confidential  Information  (as  defined  below)  that  has  not  been
previously been made available to Employee.

II.      SEVERANCE PAY AND RESTRICTIVE COVENANTS

         2.1  Severance  Pay. As partial  consideration  for the  covenants  and
agreements  by Employee  contained  herein,  the Company  agrees to pay Employee
$500,000  (the  "Severance  Pay").  The  Severance  Pay  shall  be paid in equal
quarterly  installments  over the four (4) calendar years  beginning  January 1,
2001.  Payments  shall be made on or before the  forty-fifth  (45th) day of each
calendar quarter and,  accordingly,  the first  installment  shall be payable on
February 15, 2001. The parties  acknowledge  and agree that the Severance Pay is
not  compensation in the form of wages or salary and,  accordingly,  the Company
shall have no obligation  whatsoever to withhold taxes or other amounts from any
installment  of the Severance  Pay.  Employee  agrees to pay all taxes and other
levies  of any kind that may be due with  respect  to the  Severance  Pay and to
indemnify  and hold the Company  harmless  with  respect  thereto.  Furthermore,
Employee  acknowledges  and agrees  that he shall not be  entitled to any fringe
benefits of any kind from the Company or any of the other  Affiliated  Entities.
Employee  acknowledges  that Employee's  execution of this Agreement serves as a
material  inducement to the Company's payment of the Severance Pay, and Employee
agrees  that  the  Company   will  be  entitled  to  cease  paying  any  further
installments of Severance Pay upon any breach (or any other act in contravention
of) this Agreement by Employee which is not cured within fifteen (15) days after
the Company  provides  written notice  thereof,  by certified mail, to Employee,
which notice references  specific facts constituting such breach or other act in
contravention of this Agreement.  This right of non-payment shall be in addition
to any  other  remedies,  including,  without  limitation,  injunctive  or other
equitable  remedies,  which the  Company may have  available  on account of such
breach.

         In the event the Company fails to pay any  installment of Severance Pay
which is then due and owing under the terms of this Agreement,  and such default
remains uncured for fifteen (15) days' after written notice,  by certified mail,
from  Employee,  then  Employee,  in addition to whatever  other remedies may be
available  to him,  shall be  entitled  to  accelerate  and  declare  the entire
remaining  balance of  Severance  Pay provided  hereunder  then due and owing in
full, together with interest thereon at the rate of ten percent (10%) per annum,
or the maximum lawful rate of non-usurious interest, whichever is less, from the
date any such amounts are due until paid.

         2.2 Work  Product.  Employee  agrees that all  management  or marketing
materials,  marketing  strategies,  studies or  techniques,  computer  software,
inventions,  processes and  techniques,  and  intellectual  property,  including
improvements  thereto and derivatives thereof  (collectively the "Work Product")
made,  developed or conceived by Employee  during any period of employment  with
any Affiliated  Entity and which relate to any of the Company's current business
activities,  or by any Affiliated Entity,  either by agents or employees of that
Affiliated  Entity or in cooperation with others  (including  Employee),  during
Employee's  association  with  that  Affiliated  Entity,  shall be  deemed to be
works-made-for-hire  and  Employee  shall  have no  rights  whatsoever  therein;
provided further, that if any judicial body should determine otherwise, Employee
hereby transfers any and all of Employee's  rights in or to such Work Product to
the Company. If, and to the extent,  requested from time-to-time by the Company,
Employee  agrees to execute such documents of title,  transfer and conveyance as
may be requested by the Company to evidence the sole and exclusive  ownership by
the Affiliated Entities of any and all Work Product.

         2.3  Non-Disparagement  Covenant.  Employee hereby covenants and agrees
that Employee shall, at all times hereafter, refrain from making or implying any
derogatory or negative references, statements or allusions concerning any of the
Affiliated Entities,  their officers,  agents and employees, or their respective
businesses or business  activities;  provided,  the foregoing is not intended to
prevent Employee from (i) giving truthful  responses to requests for information
made via subpoena,  in trial or through other judicial or regulatory process, or
(ii) being candid and frank in meetings of the  Company's  Board of Directors or
its committees, so long as Employee is a member thereof.

         2.4  Non-disclosure of Confidential  Information.  For purposes of this
Agreement, the term "Confidential Information" includes, without limitation, any
and  all  documents  and  information  pertaining  to  any  Affiliated  Entity's
technologies,  products or services in development,  the identity of its clients
and  suppliers,  the identity of key client or supplier  personnel with whom any
Affiliated Entity interacts to conduct business, innovations,  computer programs
and  data,  ideas,  plans,   strategies,   trade  secrets  (including,   without
limitation,  all  forms  of  business,  scientific,   economic  and  engineering
information  that any Affiliated  Entity takes  reasonable steps to keep secret,
that derives  value from not being known to the public,  and that is not readily
ascertainable  by the public  through proper  means),  proprietary  information,
advertising  strategies,  sales methods and systems,  sales and profit  figures,
accounting methods and information,  customer and client  information,  customer
and client lists, legal affairs, finances, personnel records and data, personnel
policies,  and any other documents or information of any Affiliated  Entity, the
unauthorized  use or  disclosure of which may tend to harm the interests of that
Affiliated Entity.

         Employee  recognizes  and  acknowledges  that Employee had in the past,
currently  has,  and in the future may  possibly  have,  access to  Confidential
Information and that such information is valuable,  special and unique. Employee
agrees that Employee will not disclose  Confidential  Information to any person,
firm, company, association or other entity for any purpose or reason whatsoever,
unless  (i)  such  information  becomes  available  to or  known  by the  public
generally  through no fault of Employee or (ii) disclosure is required by law or
the order of any governmental  authority under color of law, including subpoena,
provided, that prior to disclosing any information pursuant to this clause (ii),
Employee shall,  if possible,  give prior written notice thereof to the Company,
and provide the Company with the opportunity to contest such disclosure.

         Employee  agrees  to  return  to the  Company  (concurrently  with  its
execution of this Agreement) all tangible Confidential  Information and physical
or personal property of any Affiliated Entity,  including,  without  limitation,
all reports,  files,  memoranda and records, door and file keys, cardkey passes,
computer access codes and software;  provided that unless otherwise requested in
writing by the Company,  Employee may retain any of such items as are  necessary
for  Employee  to fulfill his  transitional  responsibilities  hereunder  or his
duties as a director of the Company.

         2.5 Non-Competition and Non-Solicitation.  Employee hereby agrees that,
until January 1, 2005, Employee will not, directly or indirectly, either through
any kind of ownership  (other than  ownership of securities of the Company or of
another publicly held entity of which it owns less than five percent (5%) of any
class  of  outstanding  securities),  or  as a  principal,  shareholder,  agent,
employer,  employee,  advisor,  consultant,  partner  or in  any  individual  or
representative  capacity  whatsoever,  whether  for his own  benefit  or for the
benefit of any other  person,  corporation  or other  entity,  commit any of the
following acts,  which acts shall be considered  violations of this covenant not
to compete:

         (a)  Directly  or  indirectly,  anywhere  within the  United  States of
         America,  engage in or provide, any competitive services related to any
         of the businesses in which any of the Affiliated Entities is engaged as
         of the date hereof  (collectively,  and including,  without limitation,
         urinary  tract  or  biliary  lithotripsy  ("Lithotripsy"),  lithotripsy
         database collection and management,  organizing, directing or otherwise
         leveraging the purchasing power or purchasing  efforts of the physician
         investors  in  the   Affiliated   Entities,   transurethral   microwave
         thermotherapy ("TUMT"), manufacturing,  installation, refurbishment and
         repair  of  major  medical   equipment  for  mobile  medical   services
         providers,   and  refractive   vision   correction,   the   "Prohibited
         Activities"), or provide any management services or consulting services
         related to any Prohibited Activities;

         (b) Directly or indirectly provide,  anywhere with the United States of
         America, (i) facilities,  equipment and non-physician personnel for the
         performance  by physicians of  Lithotripsy,  TUMT or refractive  vision
         correction,  or any of the other  Prohibited  Activities  described  in
         clause (a) above,  (ii) the  marketing,  scheduling  or  management  of
         Lithotripsy, TUMT or refractive vision correction, (iii) the scheduling
         of  physicians  to  perform  Lithotripsy,  TUMT  or  refractive  vision
         correction  procedures,  or (iv) the billing,  collecting or accounting
         for  the  use  of  any  such  facilities,  equipment  or  non-physician
         personnel;

         (c)  Directly  or  indirectly  request  or  advise  any  person,  firm,
         physician,  corporation or other entity having a business  relationship
         with any of the Affiliated Entities to withdraw,  curtail or cancel its
         business with any Affiliated Entity; or

         (d) Directly or indirectly hire any employee of any Affiliated  Entity,
         or induce or attempt to influence any employee of any Affiliated Entity
         to terminate its employment with such entity; however, this restriction
         shall not apply to any  person at a time when such  person  has (i) not
         been in the  employ of any  Affiliated  Entity for a period of at least
         six (6) months or (ii) been  terminated as an employee of an Affiliated
         Entity and is not then employed with any other Affiliated Entity.

         Notwithstanding the foregoing,  nothing contained in subsections (a) or
(b) or this  Section 2.5 is intended to prohibit  Employee  from (i) working for
the  American  Lithotripsy  Society,  whether  in  a  volunteer  or  compensated
capacity,  or (ii)  training  urologists  in the  use of  Lithotripsy  or  TUMT;
provided,  however,  in each case Employee  must remain in  compliance  with the
other provisions of this Agreement.

         Employee acknowledges and recognizes that the enforcement of any of the
non-competition, non-solicitation or other provisions in this Agreement will not
materially  interfere with his ability to pursue a proper  livelihood,  and that
Employee is capable of pursuing a career to earn a proper  livelihood.  Employee
recognizes  and agrees that the  enforcement  of this  Agreement is necessary to
insure the  preservation  and  continuity  of the  business  and goodwill of the
Affiliated  Entities,  and that due to the  nature of the  Affiliated  Entities'
business and the specialized training and knowledge that Employee received,  and
the  Severance  Pay  provided  for  herein,   the   non-competition   and  other
restrictions  set forth in this Agreement are reasonable as to activities,  time
and geographic area.

         2.6 Waiver Requests.  Employee shall be entitled to request a waiver of
any of the provisions of Section 2.5 orally,  provided such oral request is made
through direct  communication  (in person or  telephonically,  but not via voice
mail or other recorded  message) to the Chairman or chief  executive  officer of
the Company,  or if such titles are held by one person,  then such person or the
next most senior officer of the Company; provided any waiver granted in response
to such request must be in writing to be binding on the Company.  Alternatively,
Employee may request a waiver in writing,  but such request must be by receipted
overnight  mail  service  or  mailed  (with all  postage  and  charges  prepaid)
certified or registered mail, return receipt requested, addressed to the Company
at its  principal  executive  office  address to the attention of one of the two
officers  of the Company to which oral waiver  requests  may be made.  Complying
oral or written waiver requests (other than those related to Biliary Lithotripsy
Services,  as provided  below) shall be accepted or denied  within five (5) days
after  actual  receipt of the request by one of the two  officers of the Company
described  above.  The Company shall  respond to written  requests in writing by
mail or overnight  delivery and requests shall be deemed timely if postmarked or
deposited with the overnight delivery service within the five (5) day period. If
the  Company  fails  to  timely  respond  to a  proper  waiver  request  made in
compliance with this Section 2.6, then such request shall be deemed accepted.

         Furthermore,  notwithstanding  the  preceding  paragraph,  if  Employee
desires a waiver to engage in any activities  involving the use of lithotripters
to disintegrate biliary stones ("Biliary Lithotripsy Services"), Employee hereby
agrees to  request  such  waiver in  writing in  accordance  with the  preceding
paragraph,  and the Company shall accept or deny the request  within thirty (30)
days and otherwise in accordance with the preceding paragraph.

III.     RELEASE BY EMPLOYEE

         3.1 Released Parties.  The parties being released by Employee by virtue
of this  Agreement,  all of whom are  collectively  referred  to  herein  as the
"Company  Released  Parties," are the  Affiliated  Entities,  their  principals,
shareholders,   partners,  members,  directors,   officers,  agents,  employees,
spouses, children,  servants,  insurers, employee welfare benefit plans, pension
and/or deferred compensation plans, administrators and other fiduciaries, parent
companies, affiliated entities,  subsidiaries,  successors and assigns, and each
of them, individually and collectively.

         3.2 Release by Employee.  Employee  hereby  releases and discharges the
Company  Released   Parties  (the  "Release  by  Employee"),   individually  and
collectively,  of and from any and all claims,  causes of action,  suits, debts,
contracts, agreements, promises, liability, demands, damages, and other expenses
of any  nature  whatsoever,  at law or in  equity,  known or  unknown,  fixed or
contingent,  contemplated  or  uncontemplated,  whether  asserted or assertable,
arising out of any matter  whatsoever  which has occurred  from the beginning of
time up through and including the date hereof.  Without  limiting the generality
of the foregoing,  Employee hereby  acknowledges  and agrees that the Release by
Employee is intended to waive and discharge any and all actions, claims, demands
and causes of action  arising  out of or in any way  related  to the  Employment
Agreement or Employee's  employment by, or service as an officer or director of,
any Affiliated Entity.  However, the foregoing provisions do not, and should not
be  construed  so as to,  alter,  amend or  negate  the  enforceability  of this
Agreement, any stock options previously granted to Employee by the Company, that
certain  Indemnity   Agreement   between  the  Company  and  Employee,   or  any
partnership,  purchase or similar agreement  pursuant to which Employee acquired
any ownership  interests in any of the subsidiaries or affiliates of the Company
(collectively, the "Surviving Contracts").

         3.3 Construction.  The Release by Employee is intended to be and should
be construed as a general,  complete and final waiver and release of all claims.
The Release by Employee is being made and executed by Employee  individually and
on  behalf  of  Employee's  heirs,  successors,  assigns,  agents,  all  persons
subrogated to Employee's  rights or to whom  Employee's  rights are secondary or
derivative,  and all other  persons on behalf of whom  Employee is authorized to
act.

IV.      RELEASE BY THE COMPANY

         4.1 Release by the Company.  The Company hereby releases and discharges
Employee (the  "Release by the Company") of and from any and all claims,  causes
of action, suits, debts, contracts,  agreements,  promises,  liability, demands,
damages, and other expenses of any nature whatsoever,  at law or in equity, know
or  unknown,  fixed  or  contingent,  contemplated  or  uncontemplated,  whether
asserted or assertable,  arising out of any matter whatsoever which has occurred
from the  beginning of time up through and  including  the date hereof.  Without
limiting the generality of the foregoing,  the Company hereby  acknowledges  and
agrees that the Release by the  Company is intended to waive and  discharge  any
and all actions,  claims,  demands and causes of action arising out of or in any
way related to the Employment Agreement or Employee's  employment by, or service
as an officer or director of, any  Affiliated  Entity.  However,  the  foregoing
provisions do not, and should not be construed so as to, alter,  amend or negate
the  enforceability  of this  Agreement or the rights of any  Affiliated  Entity
under the Surviving Contracts.

         4.2  Construction.  The  Release by the  Company is  intended to be and
should be construed  as a general,  complete and final waiver and release of all
claims.  The Release by the Company is being made and executed by the Company on
its own behalf and on behalf of its successors, assigns, affiliates, agents, all
persons  subrogated to the Company's  rights or to whom the Company's rights are
secondary or derivative,  and all other persons on behalf of whom the Company is
authorized to act.

V.       MISCELLANEOUS PROVISIONS

         5.1   Acknowledgments   and  Integration.   Employee  hereby  warrants,
represents,  acknowledges and agrees that Employee has fully and completely read
this  Agreement  and has had adequate  opportunity  to consider and seek counsel
regarding  its terms and effect,  that this  Agreement,  including  the Releases
contained  herein,  is being  executed  voluntarily,  with  full  knowledge  and
understanding  of its  terms and  effects,  and that  there  are no  agreements,
statements  or  representations  except those  expressly  set forth herein which
constitute a part  hereof.  This  Agreement,  including  the Releases  contained
herein,  shall not be subject to attack on the grounds that any factual or legal
assumptions leading to its execution were wrong or invalid in any respect.

         5.2 No Admissions.  It is expressly  understood and agreed that neither
this  Agreement,   the  Releases   contained  herein,   nor  the  furnishing  of
consideration for this Agreement or such Releases,  shall be deemed or construed
at any time for any purpose as an admission by anyone of wrongdoing or liability
of any kind, all such wrongdoing and liability being expressly denied.

         5.3  Knowledge of Claims.  Each of the Company and  Employee  expressly
warrants and  stipulates  that it intends for the Releases  contained  herein to
release any and all claims that each may now have against the other,  regardless
of whether such claims have been asserted and  regardless of whether such claims
arise out of or are  related in any way to any facts in  existence  on or before
the date of this Agreement.

         5.4 Governing Law and  Construction.  This  Agreement is performable in
Travis County,  Texas,  and is governed by the laws of Texas.  The parties agree
that Travis  County,  Texas,  is proper  venue for all  actions  related to this
Agreement,  including,  without  limitation,  actions  related to  construction,
validity,  enforcement  and  performance.  This  Agreement  may not be modified,
altered or amended except in writing duly signed by each of the parties  hereto.
If  any  provision  of  this  Agreement  is  rendered  or  declared  illegal  or
unenforceable by reason of any existing or subsequently enacted statute, rule or
regulation,  or by order of or judgment of a court,  any and all other terms and
provisions  hereof shall remain in full force and effect as stated and set forth
herein.

     5.5 Binding Nature.  All of the covenants and agreements  contained  herein
shall  extend  to and be  binding  upon the  heirs,  executors,  administrators,
successors and assigns of the parties hereto.

         5.6  Remedies.  Each party  agrees that a violation  on its part of any
applicable  covenant  contained  in this  Agreement  will cause the other  party
irreparable  damage for which remedies at law may be insufficient  and, for that
reason, it agrees that the other party shall be entitled as a matter of right to
equitable  remedies,  including  specific  performance  and  injunctive  relief,
therefor,  without any requirement of posting bond or other form of surety.  The
right to specific  performance and injunctive  relief shall be cumulative and in
addition to whatever other remedies,  at law or in equity,  that the parties may
have, including, specifically,  recovery of additional damages. In addition, the
prevailing  party in an action to enforce any provision of this Agreement  shall
be  entitled  to recover  reimbursement  of  reasonable  legal fees and costs of
counsel incurred in connection therewith.

                            [Signature page follows]

<PAGE>

                                       S-1

                                 SIGNATURE PAGE

                                       FOR

                NON-COMPETITION, RELEASE AND SEVERANCE AGREEMENT

                                     BETWEEN

              PRIME MEDICAL SERVICES, INC. AND JOSEPH JENKINS, M.D.

         IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
duly executed and delivered on the day and year first above written.

COMPANY:                                      PRIME MEDICAL SERVICES, INC.

                                              By:

                                              Print Name:

                                              Title:

EMPLOYEE:

                                              Joseph Jenkins, M.D.

Source: [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00023-of-00352.parquet"}, [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00023-of-00352.parquet"}]]