Document:

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                                                                   Exhibit 10.52

                      THE CORPORATE PLAN FOR RETIREMENT(SM)
                                 EXECUTIVE PLAN

                               ADOPTION AGREEMENT

                                 IMPORTANT NOTE

THIS DOCUMENT HAS NOT BEEN APPROVED BY THE DEPARTMENT OF LABOR, THE INTERNAL
REVENUE SERVICE OR ANY OTHER GOVERNMENTAL ENTITY. AN ADOPTING EMPLOYER MUST
DETERMINE WHETHER THE PLAN IS SUBJECT TO THE FEDERAL SECURITIES LAWS AND THE
SECURITIES LAWS OF THE VARIOUS STATES. AN ADOPTING EMPLOYER MAY NOT RELY ON THIS
DOCUMENT TO ENSURE ANY PARTICULAR TAX CONSEQUENCES OR TO ENSURE THAT THE PLAN IS
"UNFUNDED AND MAINTAINED PRIMARILY FOR THE PURPOSE OF PROVIDING DEFERRED
COMPENSATION TO A SELECT GROUP OF MANAGEMENT OR HIGHLY COMPENSATED EMPLOYEES"
UNDER THE EMPLOYEE RETIREMENT INCOME SECURITY ACT WITH RESPECT TO THE EMPLOYER'S
PARTICULAR SITUATION. FIDELITY MANAGEMENT TRUST COMPANY, ITS AFFILIATES AND
EMPLOYEES CANNOT PROVIDE YOU WITH LEGAL ADVICE IN CONNECTION WITH THE EXECUTION
OF THIS DOCUMENT. THIS DOCUMENT SHOULD BE REVIEWED BY THE EMPLOYER'S ATTORNEY
PRIOR TO EXECUTION.

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                               ADOPTION AGREEMENT
                                    ARTICLE 1

1.01  PLAN INFORMATION

      (a)   NAME OF PLAN:

            This is the SAFETY INSURANCE COMPANY EXECUTIVE INCENTIVE
            COMPENSATION PLAN (THE "PLAN").

      (b)   NAME OF PLAN ADMINISTRATOR, IF NOT THE EMPLOYER:

                             __________________________________________

            Address:         __________________________________________

                             __________________________________________

            Phone Number:    __________________________________________

            The Plan Administrator is the agent for service of legal process for
            the Plan.

      (c)   PLAN YEAR END is December 31.

      (d)   PLAN STATUS (check one):

            (1)   /X/  Effective Date of new Plan: 1/1/2004

            (2)   / /  Amendment Effective Date:  _____________

                       The original effective date of the Plan: ____________

1.02  EMPLOYER

      (a)   THE EMPLOYER IS:    Safety Insurance Company

            Address:            20 Custom House Street
                                Boston, MA 02110
            Contact's Name:     Mr. William Begley
            Telephone Number:   (617)951-0600

            (1)   Employer's Tax Identification Number: 04-2689624
            (2)   Business form of Employer (check one):

                  (A)  /X/  Corporation (Other than a Subchapter S corporation)
                  (B)  / /  Other (e.g., Subchapter S corporation, partnership,
                            sole proprietor)

            (3)   Employer's fiscal year end: 12/31

                                        1
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      (b)   THE TERM "EMPLOYER" INCLUDES THE FOLLOWING RELATED EMPLOYER(S) (as
            defined in Section 2.01(a)(21)):

1.03  COVERAGE

      (a)   THE FOLLOWING EMPLOYEES ARE ELIGIBLE TO PARTICIPATE IN THE PLAN:

            (1)   /X/  Only those Employees listed in Attachment A will be
                       eligible to participate in the Plan.
            (2)   / /  Only those Employees in the eligible class described
                       below will be eligible to participate in the Plan:
                       _________________________________________________________

            (3)   / /  Only those Employees described in the Board of Directors
                       Resolutions attached hereto and hereby made a part hereof
                       will be eligible to participate in the Plan.

      (b)   THE ENTRY DATE(S) SHALL BE (check one):
            (1)   / /  each January 1.

            (2)   / /  each January 1 and each July 1.

            (3)   / /  each January 1 and each April 1, July 1 and October 1.

            (4)   / /  the first day of each month.

            (5)   /X/  immediate upon meeting the eligibility requirements
                       specified in Subsection 1.03(a).

1.04  COMPENSATION

      FOR PURPOSES OF DETERMINING CONTRIBUTIONS UNDER THE PLAN, COMPENSATION
      SHALL BE AS DEFINED (CHECK (a) OR (b) BELOW, AS APPROPRIATE):
      (a) /X/     IN SECTION 2.01(a)(6), (check (1) or (2) below, if and as
                  appropriate)):
            (1)  / /       but excluding (check the appropriate box(es)):

                (A) / /     Overtime Pay.

                (B) / /     Bonuses.

                (C) / /     Commissions.

                (D) / /     The value of a qualified or a non-qualified stock
                            option granted to an Employee by the Employer to the
                            extent such value is includable in the Employee's
                            taxable income.
                (E) / /     The following:
                            ____________________________________________________
            (2)  / /       except as otherwise provided below:
                           _____________________________________________________

                                        2
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      (b) / /     IN THE _______________ PLAN MAINTAINED BY THE EMPLOYER TO THE
                  EXTENT IT IS IN EXCESS OF THE LIMIT IMPOSED UNDER CODE SECTION
                  401(a)(17).

1.05  CONTRIBUTIONS

      (a) EMPLOYEE CONTRIBUTIONS (COMPLETE ALL THAT APPLY)
          (1)  /X/     Deferral Contributions. The Employer shall make a
               Deferral Contribution in accordance with, and subject to, Section
               4.01 on behalf of each Participant who has an executed salary
               reduction agreement in effect with the Employer for the calendar
               year (or portion of the calendar year) in question, not to exceed
               75% of Compensation for that calendar year, subject, however, to
               any election regarding bonuses, as set out in Subsection
               l.05(a)(2).

          (2)  /X/     Bonus Contributions. The Employer may allow Participants
               upon proper notice and approval to enter into a special salary
               reduction agreement to make Deferral Contributions in an amount
               up to 100% of any Employer paid cash bonuses designated by the
               Employer that are made for such Participants during the calendar
               year. The Compensation definition elected by the Employer in
               Section 1.04 must include bonuses if bonus contributions are
               permitted.

      (b) /X/     MATCHING CONTRIBUTIONS (CHOOSE (1) OR (2) BELOW, AND (3)
                  BELOW, AS APPLICABLE.)

          (1)  /X/     The Employer shall make a Matching Contribution on behalf
               of each Participant in an amount equal to the following
               percentage of a Participant's Deferral Contributions during the
               Plan Year (check one):
                       (A) / /  50%
                       (B) / /  100%
                       (C) / /  _____%
                       (D) / /  (Tiered Match)________% of the first _______% of
                                the Participant's Compensation contributed to
                                the Plan.

                       (E) / /  The percentage declared for the year, if any, by
                                a Board of Directors' resolution.

                       (F) /X/  Other: "75% of the Participants's Deferral
                                Contributions; PROVIDED, HOWEVER, that Deferral
                                Contributions in excess of 8% of the
                                Participant's compensation for the Plan Year
                                shall not be considered. For this purpose,
                                "compensation" shall mean the Participant's base
                                salary and annual bonus received (or deferred)
                                in such Plan Year."

          (2)  / /     Matching Contribution Offset. For each Participant who
               has made deferrals of at least the maximum amount allowed
               pursuant to Section 402(g) of the Code or the maximum allowed
               under the Employer's plan listed below to such plan, the Employer
               shall make a Matching Contribution in an amount equal to (A)
               minus (B) below:

                       (A)  The Matching Employer Contribution, as defined in
                            the _____ Plan that the Participant would have
                            received under the _______Plan on the sum of the
                            Deferral Contributions and the Participant's
                            deferrals hereunder, as defined therein, that the
                            Participant actually made to such Plan, if no limits
                            otherwise imposed by the Code, and regulations
                            issued thereunder, applied to such Matching Employer
                            Contribution and the Participant's Deferral
                            Contributions are deemed to have been made to the
                            Plan;

                                        3
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                       (B)  The Matching Employer Contributions actually made to
                            such Participant under the __________ Plan for the
                            Plan Year of the determination of the Matching
                            Contribution hereunder.

          (3)  / /     Matching Contribution Limits (check the appropriate
                       box(es)):

                  (A)  / /  Deferral Contributions in excess of_____% of the
                            Participant's Compensation for the period in
                            question shall not be considered for Matching
                            Contributions.

                       Note: If the Employer elects a percentage limit in (A)
                             above and requests the Trustee to account
                             separately for matched and unmatched Deferral
                             Contributions, the Matching Contributions allocated
                             to each Participant must be computed, and the
                             percentage limit applied, based upon each period.

                  (B)  / /  Matching Contributions for each Participant for each
                            Plan Year shall be limited to $._____

          (4)          ELIGIBILITY REQUIREMENT(S) FOR MATCHING CONTRIBUTIONS. A
                       Participant who makes Deferral Contributions during the
                       Plan Year under Section 1.05(a)shall be entitled to
                       Matching Contributions for that Plan Year if the
                       Participant satisfies the following requirement(s) (Check
                       the appropriate box(es). Options (B) and (C) may not be
                       elected together):

                  (A)  /X/  Is employed by the Employer on the last day of the
                            Plan Year.

                  (B)  / /  Earns at least 500 Hours of Service during the Plan
                            Year.

                  (C)  /X/  Earns at least 1,000 Hours of Service during the
                            Plan Year.

                  (D)  / /  Other: ______

                  (E)  / /  No requirements.

                  Note: If option (A), (B) or (C) above is selected, then
                  Matching Contributions can only be made by the Employer after
                  the Plan Year ends. Any Matching Contribution made before Plan
                  Year end shall not be subject to the eligibility requirements
                  of this Section 1.05(b)(3)).

      (c)      EMPLOYER CONTRIBUTIONS
          (1)  /X/     FIXED EMPLOYER CONTRIBUTIONS. The Employer shall make an
                       Employer Contribution on behalf of each Participant in an
                       amount determined as described below (check at least
                       one):

                  (A)  / /  In an amount equal to ______ % of each Participant's
                            Compensation each Plan Year.

                  (B)  /X/  In an amount determined and allocated as described
                            below:
                             1.75% OF THE COMBINED STATUTORY NET INCOME FROM THE
                             INSURANCE SUBSIDIARIES OF SAFETY INSURANCE GROUP,
                             INC.

                                        4
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                  (C)  / /   In an amount equal to (check at least one):
                       (i.)  / / Any profit sharing contribution that the
                                 Employer would have made on behalf of the
                                 Participant under the following qualified
                                 defined contribution plan but for the
                                 limitations imposed by Code Section 40l(a)(17):
                                 ___________________

                       (ii.) / / Any contribution described in Code Section
                                 401(m) that the Employer would have made on
                                 behalf of the Participant under the following
                                 qualified defined contribution plan but for the
                                 limitations imposed by Code Section 401(a)(17):
                                 ___________________

          (2)  / /     DISCRETIONARY EMPLOYER CONTRIBUTIONS. The Employer may
                       make Employer Contributions to the accounts of
                       Participants in any amount, as determined by the Employer
                       in its sole discretion from time to time, which amount
                       may be zero.

          (3)          ELIGIBILITY REQUIREMENT(S) FOR EMPLOYER CONTRIBUTIONS. A
                       Participant shall only be entitled to Employer
                       Contributions under Section 1.05(c)(1) for a Plan Year if
                       the Participant satisfies the following requirement(s)
                       (Check the appropriate box(es). Options (B) and (C) may
                       not be elected together):

               (A) /X/ Is employed by the Employer on the last day of the Plan
                       Year.

               (B) / / Earns at least 500 Hours of Service during the Plan Year.

               (C) / / Earns at least 1,000 Hours of Service during the Plan
                       Year.

               (D) / / Other: ____________________

               (E) / / No requirements.

1.06  DISTRIBUTION DATES

      Distribution from a Participant's Account pursuant to Section 8.02 shall
      begin upon the following date(s) (check either (a) or (b); check (c), if
      desired):

      (a) /X/  NON-CLASS YEAR ACCOUNTING (COMPLETE (1) AND (2)).

               (1) The earliest of termination of employment with the Employer
                   and the following event(s) (check appropriate box(es); if
                   none selected, all distributions will be upon termination of
                   employment):
                  (A)  / /   Attainment of Normal Retirement Age (as defined in
                             Section 1.07(f)).

                  (B)  / /   Attainment of Early Retirement Age (as defined in
                             Section 1.07(g)).

                                        5
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                  (C)  / /   The date on which the Participant becomes disabled
                             (as defined in Section l.07(h)).

               (2) Timing of distribution (check either (A) or (B)).

                  (A)  /X/   The Distribution of the Participant's Account will
                             be begin in the month following the event
                             described in (a)(1) above.

                  (B)  / /   The Distribution of the Participant's Account will
                             begin as soon as administratively feasible in the
                             calendar year following distribution event
                             described in (a)(1) above.

      (b) / /  CLASS YEAR ACCOUNTING (COMPLETE (1) AND (2)).

               (1) Upon (check at least one; (A) must be selected if plan has
                   contributions pursuant to section 1.05(b) or (c)):

                  (A)  / /   Termination of employment with the Employer.

                  (B)  / /   The date elected by the Participant, pursuant to
                             Plan Section 8.02, and subject to the restrictions
                             imposed in Plan Section 8.02 with respect to future
                             Deferral Contributions, in which event such date of
                             distribution must be at least one year after the
                             date such Deferral Contribution would have been
                             paid to the Participant in cash in the absence of
                             the election to make the Deferral Contribution.

               (2) Timing of distribution (check either (A) or (B)).

                  (A)  / /   The Distribution of the Participant's Account will
                             begin _____ (specify month and day) following the
                             event described in (b)(1) above.

                  (B)  / /   The Distribution of the Participant's Account will
                             begin _____ (specify month and day) of the calendar
                             year following the event described in (b)(1) above.

      (c)  /X/    AS SOON AS ADMINISTRATIVELY FEASIBLE FOLLOWING A CHANGE OF
           CONTROL (AS DEFINED IN SECTION 1.12).

1.07  VESTING SCHEDULE

      (a) THE PARTICIPANT'S VESTED PERCENTAGE IN MATCHING CONTRIBUTIONS ELECTED
          IN SECTION 1.05(b) SHALL BE BASED UPON THE SCHEDULE(S) SELECTED BELOW.
             (1)  / / N/A - No Matching Contributions
             (2)  / / 100% Vesting immediately
             (3)  / / 3 year cliff (see C below)
             (4)  / / 5 year cliff (see D below)
             (5)  / / 6 year graduated (see E below)

                                        6
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             (6)  / / 7 year graduated (see F below)
             (7)  /X/ G below
             (8)  / / Other (Attachment "B")

<Table>
<Caption>
              YEARS OF               VESTING SCHEDULE
            SERVICE FOR   -----------------------------------
              VESTING      C      D       E      F       G
            ------------  ----   ----   ----    ---   -------
                <S>        <C>    <C>    <C>    <C>    <C>
                0            0%     0%     0%     0%     0.00
                1            0%     0%     0%     0%    20.00
                2            0%     0%    20%     0%    40.00
                3          100%     0%    40%    20%    60.00
                4          100%     0%    60%    40%    80.00
                5          100%   100%    80%    60%   100.00
                6          100%   100%   100%    80%   100.00
                7          100%   100%   100%   100%      100%
</Table>

      (b) THE PARTICIPANT'S VESTED PERCENTAGE IN EMPLOYER CONTRIBUTIONS ELECTED
          IN SECTION 1.05(c) SHALL BE BASED UPON THE SCHEDULE(S) SELECTED BELOW.

             (1)  / / N/A - No Employer Contributions
             (2)  / / 100% Vesting immediately
             (3)  / / 3 year cliff (see C below)
             (4)  / / 5 year cliff (see D below)
             (5)  / / 6 year graduated (see E below)
             (6)  / / 7 year graduated (see F below)
             (7)  /X/ G below
             (8)  / / Other (Attachment "B")

<Table>
<Caption>
                YEARS OF               VESTING SCHEDULE
              SERVICE FOR   -----------------------------------
                VESTING      C      D       E      F       G
              ------------  ----   ----   ----    ---   -------
                  <S>        <C>    <C>    <C>    <C>    <C>
                  0            0%     0%     0%     0%     0.00
                  1            0%     0%     0%     0%    20.00
                  2            0%     0%    20%     0%    40.00
                  3          100%     0%    40%    20%    60.00
                  4          100%     0%    60%    40%    80.00
                  5          100%   100%    80%    60%   100.00
                  6          100%   100%   100%    80%   100.00
                  7          100%   100%   100%   100%      100%
</Table>

      (c) / / YEARS OF SERVICE FOR VESTING SHALL EXCLUDE (check one):

               (1) / / for new plans, service prior to the Effective Date as
                       defined in Section 1.01(d)(1).

                                        7
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            (2) / / for existing plans converting from another plan
                    document, service prior to the original Effective
                    Date as defined in Section 1.01(d)(2).

      (d)   / /  A PARTICIPANT WILL FORFEIT HIS MATCHING CONTRIBUTIONS AND
                 EMPLOYER CONTRIBUTIONS UPON THE OCCURRENCE OF THE FOLLOWING
                 EVENT(S):

                 ------------------------------

      (e)   A PARTICIPANT WILL BE 100% VESTED IN HIS MATCHING CONTRIBUTIONS AND
            EMPLOYER CONTRIBUTIONS UPON (CHECK THE APPROPRIATE BOX(ES), IF ANY;
            IF 1.06(c) IS SELECTED, PARTICIPANTS WILL AUTOMATICALLY VEST UPON
            CHANGE OF CONTROL AS DEFINED IN SECTION 1.12):

            (1) / /    Normal Retirement Age (as defined in Section 1.07(e)).

            (2) / /    Early Retirement Age (as defined in Section 1.07(f)).

            (3) /x/    Death.

            (4) /x/    The date on which the Participant becomes disabled, as
                       determined under Section 1.07(h) of the Plan.

      (f)   NORMAL RETIREMENT AGE UNDER THE PLAN IS (check one):

            (1) /x/    age 65.

            (2) / /    age __ (specify from 55 through 64).

            (3) / /    the later of age __ (cannot exceed 65) or the fifth
                       anniversary of the Participant's Commencement Date.

            If no box is checked in this Section 1.07(f), then Normal
            Retirement Age is 65.

      (g)  / /  EARLY RETIREMENT AGE IS THE FIRST DAY OF THE MONTH AFTER THE
                PARTICIPANT ATTAINS AGE __ (SPECIFY 55 OR GREATER) AND
                COMPLETES __ YEARS OF SERVICE FOR VESTING.

      (h)  /x/  THE DATE ON WHICH A PARTICIPANT BECOMES DISABLED IS
                DETERMINED (CHECK ONE):

           (1)  /x/    under the long-term disability plan maintained by the
                       Employer in which the Participant participates.

           (2)  / /    under Title II or XVI of the Social Security Act.

           (3)  / /    in the sole discretion of the Administrator based on
                       factors applied in a uniform and nondiscriminatory
                       manner.

                                        8
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1.08  PREDECESSOR EMPLOYER SERVICE

      / /      SERVICE FOR PURPOSES OF VESTING IN SECTION 1.07(a) AND (b) SHALL
               INCLUDE SERVICE WITH THE FOLLOWING EMPLOYER(S):

1.09  UNFORESEEABLE EMERGENCY WITHDRAWALS

      PARTICIPANT WITHDRAWALS FOR UNFORESEEABLE EMERGENCY PRIOR TO TERMINATION
      OF EMPLOYMENT (CHECK ONE; (b) must be selected if 1.06(b) HAS BEEN
      SELECTED):

        (a) /X/   WILL BE ALLOWED IN ACCORDANCE WITH SECTION 7.07, SUBJECT
                  TO A $1,000 MINIMUM AMOUNT. (MUST BE AT LEAST $1,000)

        (b) / /   WILL NOT BE ALLOWED.

1.10  DISTRIBUTIONS

      SUBJECT TO ARTICLES 7 AND 8 DISTRIBUTIONS UNDER THE PLAN ARE ALWAYS
      AVAILABLE AS A LUMP SUM. CHECK BELOW TO ALLOW DISTRIBUTIONS IN INSTALLMENT
      PAYMENTS:

      /X/   UNDER A SYSTEMATIC WITHDRAWAL PLAN (INSTALLMENTS) NOT TO EXCEED 10
            YEARS.

1.11  INVESTMENT DECISIONS

      (a)   INVESTMENT DIRECTIONS
            Investments in which the Accounts of Participants shall be treated
            as invested and reinvested shall be directed (check one);

            (1) / /    by the EMPLOYER among the options listed in (b)
                       below.

            (2) /X/    by each PARTICIPANT among the options listed in (b)
                       below.

            (3) / /    in accordance with investment directions provided by
                each Participant for all contribution sources in a Participant's
                Account except the following sources shall be invested as
                directed by the Employer (check (A) and/or (B)):

                  (A) / /   Nonelective Employer Contributions

                  (B) / /   Matching Employer Contributions

                  The Employer must direct the applicable sources among the same
                  investment options made available for Participant directed
                  sources listed in the Service Agreement.

      (b)   PLAN INVESTMENT OPTIONS
            Participant Accounts will be treated as invested among the
            Investment Funds listed in the Service Agreement from time to time
            pursuant to Participant and/or Employer directions, as applicable.

            Note: The method and frequency for change of investments will be
                  determined under the rules applicable to the selected funds.
                  Information will be provided regarding expenses, if any, for
                  changes in investment options.

                                        9
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1.12  CHANGE IN CONTROL

      IF SECTION 1.06(c) IS SELECTED, THEN, PURSUANT TO SECTION 7.08 AND
      NOTWITHSTANDING ANY OTHER PROVISION OF THE PLAN TO THE CONTRARY, THE
      ACCOUNT BALANCES OF ALL PARTICIPANTS SHALL THE BECOME IMMEDIATELY
      NONFORFEITABLE AND SHALL BECOME PAYABLE TO THE PARTICIPANTS AS SOON AS
      PRACTICABLE UPON A CHANGE IN THE CONTROL OF THE EMPLOYER, AS DEFINED
      BELOW:

      SEE ATTACHMENT C

                  NOTE: INTERNAL REVENUE CODE SECTION 280G COULD IMPOSE CERTAIN,
                  ADVERSE TAX CONSEQUENCES ON BOTH PARTICIPANTS AND THE EMPLOYER
                  AS A RESULT OF THE APPLICATION OF SECTION 1.12. THE EMPLOYER
                  SHOULD CONSULT WITH ITS ATTORNEY PRIOR TO SELECTING TO APPLY
                  SECTION 1.06(c).

1.13  RELIANCE ON PLAN

      An adopting Employer may not rely solely on this Plan to ensure that the
      Plan is "unfunded and maintained primarily for the purpose of providing
      deferred compensation for a select group of management or highly
      compensated employees" with respect to the Employer's particular
      situation. This Agreement must be reviewed by the Employer's attorney
      before it is executed.

      This Adoption Agreement may be used only in conjunction with the
      CORPORATEplan for Retirement Executive Plan Basic Plan Document.

                                       10
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                                 EXECUTION PAGE
                                (FIDELITY'S COPY)

IN WITNESS WHEREOF, the Employer has caused this Adoption Agreement to be
executed this 11TH day of DECEMBER, 2003.

                         Employer      SAFETY INSURANCE CO.
                                       -----------------------------------------

                         By            /s/ William J. Begley
                                       -----------------------------------------

                         Title         VP TREASURER, CFO
                                       -----------------------------------------

                         Employer
                                       -----------------------------------------

                         By
                                       -----------------------------------------

                         Title
                                       -----------------------------------------

                                       11
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                                    ADDENDUM

Notwithstanding Section 4.0l(b) of The CORPORATE plan for Retirement Executive
Plan (Basic Plan Document), as adopted by Safety Insurance Company pursuant to
the Adoption Agreement, solely with respect to the annual bonus payments to be
made in calendar year 2005 respecting services in calendar year 2004, a salary
reduction agreement applicable to such bonus deferral may be made on or before
March 15, 2005 or, if earlier, before the annual bonuses first become payable.

                                       12<Page>

                                                                   Exhibit 10.53

                                 TRUST AGREEMENT

                                     BETWEEN

                            SAFETY INSURANCE COMPANY

                     [                                     ]

                                       AND

                        FIDELITY MANAGEMENT TRUST COMPANY

                                   ----------

                     [                                     ]

                                      TRUST

                                                                          [SEAL]

                             Dated as of [1/1], 2004

<Page>

                                TABLE OF CONTENTS

<Table>
<Caption>
SECTION                                                                   PAGE
-------                                                                   ----
<S>                                                                         <C>
1  DEFINITIONS ..............................................................2

2  TRUST ....................................................................3
   (a) Establishment
   (b) Grantor Trust
   (c) Trust Assets
   (d) Non-Assignment

3  PAYMENTS TO SPONSOR ......................................................4

4  DISBURSEMENT .............................................................4
   (a) Directions from Administrator
   (b) Limitations

5  INVESTMENT OF TRUST ......................................................5
   (a) Selection of Investment Options
   (b) Available Investment Options
   (c) Investment Directions
   (d) Funding Mechanism
   (e) Mutual Funds
   (f) Trustee Powers

6  RECORDKEEPING AND ADMINISTRATIVE SERVICES TO BE PERFORMED ................7
   (a) General
   (b) Accounts
   (c) Inspection and Audit
   (d) Notice of Plan Amendment
   (e) Returns, Reports and Information

7  COMPENSATION AND EXPENSES ................................................9

8  DIRECTIONS AND INDEMNIFICATION ...........................................9
   (a) Identity of Administrator
   (b) Directions from Administrator
   (c) Directions from Participants
   (d) Indemnification
   (e) Survival

9  RESIGNATION OR REMOVAL OF TRUSTEE .......................................10
   (a) Resignation and Removal
   (b) Termination
   (c) Notice Period
   (d) Transition Assistance
   (e) Failure to Appoint Successor

10 SUCCESSOR TRUSTEE .......................................................11
   (a) Appointment
   (b) Acceptance
   (c) Corporate Action
</Table>

                                        i
<Page>

                                TABLE OF CONTENTS
                                   (CONTINUED)

<Table>
<Caption>
SECTION                                                                   PAGE
-------                                                                   ----
<S>                                                                         <C>
11 RESIGNATION, REMOVAL, AND TERMINATION NOTICES ...........................11

12 DURATION ................................................................11

13 INSOLVENCY OF SPONSOR ...................................................12

14 AMENDMENT OR MODIFICATION ...............................................13

15 ELECTRONIC SERVICES .....................................................13

16 GENERAL .................................................................14
   (a) Performance by Trustee, its Agent or Affiliates
   (b) Entire Agreement
   (c) Waiver
   (d) Successors and Assigns
   (e) Partial Invalidity
   (f) Section Headings

17 ASSIGNMENT ..............................................................15

18 FORCE MAJEURE ...........................................................15

19 CONFIDENTIALITY .........................................................16

20 GOVERNING LAW ...........................................................16
   (a) Massachusetts Law Controls
   (b) Trust Agreement Controls
</Table>

                                       ii
<Page>

     TRUST AGREEMENT, dated as of the 1ST day of JANUARY 2004, between SAFETY
INSURANCE COMPANY, a MA corporation, having an office at 20 CUSTOM HOUSE ST.
BOSTON, MA (the "Sponsor"), and FIDELITY MANAGEMENT TRUST COMPANY, a
Massachusetts trust company, having an office at 82 Devonshire Street, Boston,
Massachusetts 02109 (the "Trustee").

                                   WITNESSETH:

     WHEREAS, the Sponsor is the sponsor of the SAFETY INSURANCE COMPANY
EXECUTIVE INCENTIVE COMPENSATION PLAN (the "Plan"); and

     WHEREAS, the Sponsor wishes to establish an irrevocable trust and to
contribute to the trust assets that shall be held therein, subject to the claims
of Sponsor's creditors in the event of Sponsor's Insolvency, as herein defined,
until paid to Participants and their beneficiaries in such manner and at such
times as specified in the Plan; and

     WHEREAS, it is the intention of the parties that this Trust shall
constitute an unfunded arrangement and shall not affect the status of the Plan
as an unfunded plan maintained for the purpose of providing deferred
compensation for a select group of management or highly compensated employees
for purposes of Title I of the Employee Retirement Income Security Act of 1974
("ERISA"); and

     WHEREAS, it is the intention of the Sponsor to make contributions to the
trust to provide itself with a source of funds to assist it in the meeting of
its liabilities under the Plan; and

     WHEREAS, the Trustee is willing to hold and invest the aforesaid plan
assets in trust among several investment options selected by the Sponsor; and

     WHEREAS, the Sponsor wishes to have the Trustee perform certain ministerial
recordkeeping and administrative functions under the Plan; and

     WHEREAS, SAFETY INSURANCE COMPANY (the "Administrator") is the
administrator of the Plan; and

     WHEREAS, the Trustee is willing to perform recordkeeping and administrative
services for the Plan if the services are purely ministerial in nature and are
provided within a framework of plan provisions, guidelines and interpretations
conveyed in writing to the Trustee by the Administrator.

                                        1
<Page>

     NOW, THEREFORE, in consideration of the foregoing premises and the mutual
covenants and agreements set forth below, the Sponsor and the Trustee agree as
follows:

SECTION 1. DEFINITIONS. The following terms as used in this Trust Agreement have
the meaning indicated unless the context clearly requires otherwise:

(a)  "ADMINISTRATOR" shall mean, with respect to the Plan, the person or entity
     which is the "administrator" of such Plan.

(b)  "AGREEMENT" shall mean this Trust Agreement, as the same may be amended and
     in effect from time to time.

(c)  "BUSINESS DAY" shall mean any day on which the New York Stock Exchange
     (NYSE) is open.

(d)  "CODE" shall mean the Internal Revenue Code of 1986, as it has been or may
     be amended from time to time.

(e)  "ERISA" shall mean the Employee Retirement Income Security Act of 1974, as
     it has been or may be amended from time to time.

(f)  "FIDELITY MUTUAL FUND" shall mean any investment company advised by
     Fidelity Management & Research Company or any of its affiliates.

(g)  "MUTUAL FUND" shall refer both to Fidelity Mutual Funds and Non-Fidelity
     Mutual Funds.

(h)  "NON-FIDELITY MUTUAL FUND" shall mean certain investment companies not
     advised by Fidelity Management & Research Company or any of its affiliates.

(i)  "PARTICIPANT" shall mean, with respect to the Plan, any employee (or former
     employee) with an account under the Plan, which has not yet been fully
     distributed and/or forfeited, and shall include the designated
     beneficiary(ies) with respect to the account of any deceased employee (or
     deceased former employee) until such account has been fully distributed
     and/or forfeited.

(j)  "Permissible Investment" shall mean the investments specified by the
     Employer as available for investment of assets of the Trust and agreed to
     by the Trustee and the Prototype Sponsor. The Permissible Investments under
     the Plan shall be listed in the Service Agreement.

(k)  "PLAN" shall mean the SAFETY INSURANCE COMPANY EXECUTIVE INCENTIVE
     COMPENSATION PLAN.

(l)  "RECONCILIATION PERIOD" shall mean the period beginning on the date of the
     initial transfer of assets to the Trust and ending on the date of the
     completion of the reconciliation of Participant records.

(m)  "REPORTING DATE" shall mean the last day of each calendar quarter, the date
     as of which the Trustee resigns or is removed pursuant to this Agreement
     and the date as of which this Agreement terminates pursuant to Section 9
     hereof.

(n)  "SERVICE AGREEMENT" shall mean the agreement between the Trustee and the
     Sponsor for the Trustee, through certain affiliates and related companies,
     to provide administrative and recordkeeping services for the Plan.

                                        2
<Page>

(o)  "SPONSOR" shall mean SAFETY INSURANCE COMPANY, a MA corporation, or any
     successor to all or substantially all of its businesses which, by
     agreement, operation of law or otherwise, assumes the responsibility of the
     Sponsor under this Agreement.

(p)  "TRUST" shall mean the SAFETY INSURANCE COMPANY EXECUTIVE INCENTIVE
     COMPENSATION PLAN Trust, being the trust established by the Sponsor and
     the Trustee pursuant to the provisions of this Agreement.

(q)  "TRUSTEE" shall mean Fidelity Management Trust Company, a Massachusetts
     trust company and any successor to all or substantially all of its trust
     business. The term Trustee shall also include any successor trustee
     appointed pursuant to this agreement to the extent such successor agrees to
     serve as Trustee under this Agreement.

SECTION 2. TRUST.

             (a)  ESTABLISHMENT. The Sponsor hereby establishes the Trust, with
the Trustee. The Trust shall consist of an initial contribution of money or
other property acceptable to the Trustee in its sole discretion, made by the
Sponsor or transferred from a previous trustee under the Plan, such additional
sums of money as shall from time to time be delivered to the Trustee under the
Plan, all investments made therewith and proceeds thereof, and all earnings and
profits thereon, less the payments that are made by the Trustee as provided
herein, without distinction between principal and income. The Trustee hereby
accepts the Trust on the terms and conditions set forth in this Agreement. In
accepting this Trust, the Trustee shall be accountable for the assets received
by it, subject to the terms and conditions of this Agreement.

             (b)  GRANTOR TRUST. The Trust is intended to be a grantor trust, of
which the Sponsor is the grantor, within the meaning of subpart E, part 1,
subchapter J, chapter 1, subtitle A of the Code, as amended, and shall be
construed accordingly.

             (c)  TRUST ASSETS. The principal of the Trust, and any earnings
thereon shall be held separate and apart from other funds of the Sponsor and
shall be used exclusively for the uses and purposes of Participants and general
creditors as herein set forth. Participants and their beneficiaries shall have
no preferred claim on, or any beneficial ownership interest in, any assets of
the Trust. Any rights created under the Plan and this Trust Agreement shall be
mere unsecured contractual rights of Participants and their beneficiaries
against the Sponsor. Any assets held by the Trust will be subject to the claims
of the Sponsor's general creditors under federal and state law in the event of
Insolvency, as defined in this Agreement.

                                        3
<Page>

             (d)  NON-ASSIGNMENT. Benefit payments to Participants and their
beneficiaries funded under this Trust may not be anticipated, assigned (either
at law or in equity), alienated, pledged, encumbered, or subjected to
attachment, garnishment, levy, execution, or other legal or equitable process.

SECTION 3. PAYMENTS TO SPONSOR. Except as provided under this Agreement, the
Sponsor shall have no right to retain or divert to others any of the Trust
assets before all payment of benefits have been made to the Participants and
their beneficiaries pursuant to the terms of the Plan.

SECTION 4. DISBURSEMENTS.

             (a)  DIRECTIONS FROM ADMINISTRATOR.

                  (i)   If it is indicated in the Service Agreement that the
Trustee will make distributions of Plan benefits directly to Participants and
beneficiaries, the Trustee shall disburse monies to Participants and their
beneficiaries for benefit payments in the amounts that the Administrator directs
from time to time in writing. The Trustee shall have no responsibility to
ascertain whether the Administrator's direction compiles with the terms of the
Plan or of any applicable law. The Trustee shall be responsible for Federal or
State income tax reporting or withholding with respect to such Plan benefits.
The Trustee shall not be responsible for FICA (Social Security and Medicare),
any Federal or State unemployment or local tax with respect to Plan
distributions.

                  (ii)  If it is indicated in the Service Agreement that the
Sponsor shall be responsible for making distributions of benefits to
Participants and beneficiaries, then the Trustee shall disburse monies to the
Administrator for benefit payments in the amounts that the Administrator directs
from time to time in writing. The Trustee shall have no responsibility to
ascertain whether the Administrator's direction complies with the terms of the
Plan or any applicable law. The Trustee shall not be responsible for: (1) making
benefit payments to Participants under the Plan, (2) any Federal, State or local
income tax reporting or withholding with respect to such Plan benefits, and (3)
FICA (Social Security and Medicare) or any Federal or State unemployment tax
with respect to Plan distributions.

             (b)  LIMITATIONS. The Trustee shall not be required to make any
disbursement in excess of the net realizable value of the assets of the Trust at
the time of the disbursement. The Trustee shall not be required to make any
disbursement in cash unless the Administrator has provided a written direction
as to the assets to be converted to cash for the purpose of making the
disbursement.

SECTION 5. INVESTMENT OF TRUST.

                                        4
<Page>

             (a)  SELECTION OF INVESTMENT OPTIONS. The Trustee shall have no
responsibility for the selection of investment options under the Trust and shall
not render investment advice to any person in connection with the selection of
such options.

             (b)  AVAILABLE INVESTMENT OPTIONS. The Sponsor shall direct the
Trustee as to what investment options the Trust shall be invested in (i) during
the Reconciliation Period, and (ii) following the Reconciliation Period, subject
to the following limitations. The Sponsor may determine to offer as investment
options only Permissible Investments as described in the Service Agreement;
provided, however, that the Trustee shall not be considered a fiduciary with
investment discretion. The Sponsor may add or remove investment options with the
consent of the Trustee and upon mutual amendment of the Service Agreement to
reflect such additions.

             (c)  INVESTMENT DIRECTIONS. In order to provide for an accumulation
of assets comparable to the contractual liabilities accruing under the Plan, the
Sponsor may direct the Trustee in writing to invest the assets held in the Trust
to correspond to the hypothetical investments made for Participants in
accordance with their direction under the Plan.

             (d)  The Sponsor's designation of available investment options
under paragraphs (a) and (b) above, the maintenance of accounts for each Plan
Participant and the crediting of investments to such accounts, and the exercise
by Participants of any powers relating to investments under this Section 5 are
solely for the purpose of providing a mechanism for measuring the obligation of
the Sponsor to any particular Participant under the applicable Plan. As further
provided in this Agreement, no Participant or beneficiary will have any
preferential claim to or beneficial ownership interest in any asset or
investment held in the Trust, and the rights of any participant and his or her
beneficiaries under the applicable Plan and this Agreement are solely those of
an unsecured general creditor of the Sponsor with respect to the benefits of the
Participant under the Plan.

             (e)  MUTUAL FUNDS. The Sponsor hereby acknowledges that it has
received from the Trustee a copy of the prospectus for each Mutual Fund selected
by the Sponsor as a Plan investment option. Trust investments in Mutual Funds
shall be subject to the following limitations:

                  (i)   EXECUTION OF PURCHASES AND SALES. Purchases and sales of
Permissible Investments (other than for Exchanges) shall be made on the date on
which the Trustee receives from the Sponsor in good order all information and
documentation necessary to accurately effect such purchases and sales (or in the
case of a purchase, the subsequent date on which the Trustee has received a wire
transfer of funds necessary to make such purchase). Exchanges of Permissible
Investments shall be made on the same

                                        5
<Page>

Business Day that the Trustee receives a proper direction if received before
market close (generally 4:00 p.m. eastern time); if the direction is received
after market close (generally 4:00 p.m. eastern time), the exchange shall be
made the following Business Day.

                  (ii)  VOTING. At the time of mailing of notice of each annual
or special stockholder's meeting of any Mutual Fund, the Trustee shall send a
copy of the notice and all proxy solicitation materials to the Sponsor, together
with a voting direction form for return to the Trustee or its designee. The
Trustee shall vote the shares held in the Trust in the manner as directed by the
Sponsor. The Trustee shall not vote shares for which it has received no
corresponding directions from the Sponsor. The Sponsor shall also have the right
to direct the Trustee as to the manner in which all shareholder rights, other
than the right to vote, shall be exercised. The Trustee shall have no duty to
solicit directions from the Sponsor.

             (f)  TRUSTEE POWERS. The Trustee shall have the following powers
and authority:

                  (i)   Subject to paragraphs (b), (c) and (d) of this Section
5, to sell, exchange, convey, transfer, or otherwise dispose of any property
held in the Trust, by private contract or at public auction. No person dealing
with the Trustee shall be bound to see to the application of the purchase money
or other property delivered to the Trustee or to inquire into the validity,
expediency, or propriety of any such sale or other disposition.

                  (ii)  To cause any securities or other property held as part
of the Trust to be registered in the Trustee's own name, in the name of one or
more of its nominees, or in the Trustee's account with the Depository Trust
Company of New York and to hold any investments in bearer form, but the books
and records of the Trustee shall at all times show that all such investments are
part of the Trust.

                  (iii) To keep that portion of the Trust in cash or cash
balances as the Sponsor or Administrator may, from time to time, deem to be in
the best interest of the Trust.

                  (iv)  To make, execute, acknowledge, and deliver any and all
documents of transfer or conveyance and to carry out the powers herein granted.

                                        6
<Page>

             (b)  ACCOUNTS. The Trustee shall keep accurate accounts of all
investments, receipts, disbursements, and other transactions hereunder, and
shall report the value of the assets held in the Trust as of the last day of
each fiscal quarter of the Plan and, if not on the last day of a fiscal quarter,
the date on which the Trustee resigns or is removed as provided in this
Agreement or is terminated as provided in this Agreement. Within thirty (30)
days following each Reporting Date or within sixty (60) days in the case of a
Reporting Date caused by the resignation or removal of the Trustee, or the
termination of this Agreement, the Trustee shall file with the Administrator a
written account setting forth all investments, receipts, disbursements, and
other transactions effected by the Trustee between the Reporting Date and the
prior Reporting Date, and setting forth the value of the Trust as of the
Reporting Date. Except as otherwise required under applicable law, upon the
expiration of six (6) months from the date of filing such account with the
Administrator, the Trustee shall have no liability or further accountability to
anyone with respect to the propriety of its acts or transactions shown in such
account, except with respect to such acts or transactions as to which the
Sponsor shall within such six (6) month period file with the Trustee written
objections.

             (c)  INSPECTION AND AUDIT. All records generated by the Trustee in
accordance with paragraphs (a) and (b) shall be open to inspection and audit,
during the Trustee's regular business hours prior to the termination of this
Agreement, by the Administrator or any person designated by the Administrator.
Upon the resignation or removal of the Trustee or the termination of this
Agreement, the Trustee shall provide to the Administrator, at no expense to the
Sponsor, in the format regularly provided to the Administrator, a statement of
each Participant's accounts as of the resignation, removal, or termination, and
the Trustee shall provide to the Administrator or the Plan's new recordkeeper
such further records as are reasonable, at the Sponsor's expense.

             (d)  EFFECT OF PLAN AMENDMENT. The Trustee's provision of the
recordkeeping and administrative services set forth in this Section shall be
conditioned on the Sponsor delivering to the Trustee a copy of any amendment to
the Plan as soon as administratively feasible following the amendment's
adoption, and on the Administrator providing the Trustee on a timely basis with
all the information the Administrator deems necessary for the Trustee to perform
the recordkeeping and administrative services and such other information as the
Trustee may reasonably request.

             (e)  RETURNS, REPORTS AND INFORMATION. Except as set forth in the
Service Agreement, the Administrator shall be responsible for the preparation
and filing of all returns, reports, and information required of the Trust or
Plan by law. The Trustee shall provide the Administrator with such information
as the Administrator may reasonably request to make these filings. The
Administrator shall also be responsible for making any disclosures to
Participants required by law.

                                        8
<Page>

SECTION 7. COMPENSATION AND EXPENSES. Sponsor shall pay to Trustee, within
thirty (30) days of receipt of the Trustee's bill, the fees for services in
accordance with the Service Agreement. All fees for services are specifically
outlined in the Service Agreement and are based on any assumptions identified
therein.

             All reasonable expenses of plan administration as shown on the
Service Agreement, as amended from time to time, shall be a charge against and
paid from the appropriate plan Participants' accounts, except to the extent such
amounts are paid by the Plan Sponsor in a timely manner.

             All expenses of the Trustee relating directly to the acquisition
and disposition of investments constituting part of the Trust, and all taxes of
any kind whatsoever that may be levied or assessed under existing or future laws
upon or in respect of the Trust or the income thereof, shall be a charge against
and paid from the appropriate Participants' accounts.

SECTION 8. DIRECTIONS AND INDEMNIFICATION.

             (a)  IDENTITY OF ADMINISTRATOR. The Trustee shall be fully
protected in relying on the fact that the Administrator under the Plan is the
individual or persons named as such above or such other individuals or persons
as the Sponsor may notify the Trustee in writing.

             (b)  DIRECTIONS FROM ADMINISTRATOR. Whenever the Administrator
provides a direction to the Trustee, the Trustee shall not be liable for any
loss, or by reason of any breach, arising from the direction if the direction is
contained in a writing (or is oral and immediately confirmed in a writing)
signed by any individual whose name and signature have been submitted (and not
withdrawn) in writing to the Trustee by the Administrator in the manner
described in the Service Agreement, provided the Trustee reasonably believes the
signature of the individual to be genuine. Such direction may be made via
electronic data transfer ("EDT") in accordance with procedures agreed to by the
Administrator and the Trustee; provided, however, that the Trustee shall be
fully protected in relying on such direction as if it were a direction made in
writing by the Administrator. The Trustee shall have no responsibility to
ascertain any direction's (i) accuracy, (ii) compliance with the terms of the
Plan or any applicable law, or (iii) effect for tax purposes or otherwise.

             (c)  DIRECTIONS FROM PARTICIPANTS. The Trustee shall not be liable
for any loss, which arises, from any Participant's exercise or non-exercise of
rights under this Agreement over the hypothetical assets in the Participant's
accounts.

                                        9
<Page>

             (c)  FAILURE TO APPOINT SUCCESSOR. If, by the termination date, the
Sponsor has not notified the Trustee in writing as to the individual or entity
to which the assets and cash are to be transferred and delivered, the Trustee
may bring an appropriate action or proceeding for leave to deposit the assets
and cash in a court of competent jurisdiction. The Trustee shall be reimbursed
by the Sponsor for all costs and expenses of the action or proceeding including,
without limitation, reasonable attorneys' fees and disbursements.

SECTION 10. SUCCESSOR TRUSTEE.

             (a)  APPOINTMENT. If the office of Trustee becomes vacant for any
reason, the Sponsor may in writing appoint a successor trustee under this
Agreement. The successor trustee shall have all of the rights, powers,
privileges, obligations, duties, liabilities, and immunities granted to the
Trustee under this Agreement. The successor trustee and predecessor trustee
shall not be liable for the acts or omissions of the other with respect to the
Trust.

             (b)  ACCEPTANCE. When the successor trustee accepts its appointment
under this Agreement, title to and possession of the Trust assets shall
immediately vest in the successor trustee without any further action on the part
of the predecessor trustee. The predecessor trustee shall execute all
instruments and do all acts that reasonably may be necessary or reasonably may
be requested in writing by the Sponsor or the successor trustee to vest title to
all Trust assets in the successor trustee or to deliver all Trust assets to the
successor trustee.

             (c)  CORPORATE ACTION. Any successor of the Trustee or successor
trustee, through sale or transfer of the business or trust department of the
Trustee or successor trustee, or through reorganization, consolidation, or
merger, or any similar transaction, shall, upon consummation of the transaction,
become the successor trustee under this Agreement.

SECTION 11. RESIGNATION, REMOVAL, AND TERMINATION NOTICES. All notices of
resignation, removal, or termination under this Agreement must be in writing and
mailed to the party to which the notice is being given by certified or
registered mail, return receipt requested, to the Sponsor at the address
designated in the Service Agreement, and to the Trustee c/o John M. Kimpel,
Fidelity Investments, 82 Devonshire Street, F7A, Boston, Massachusetts 02109, or
to such other addresses as the parties have notified each other of in the
foregoing manner.

SECTION 12. DURATION. This Trust shall continue in effect without limit as to
time, subject, however, to the provisions of this Agreement relating to
amendment, modification, and termination thereof.

                                       11
<Page>

SECTION 13. INSOLVENCY OF SPONSOR.

             (a)  Trustee shall cease disbursement of funds for payment of
benefits to Participants and their beneficiaries if the Sponsor is Insolvent.
Sponsor shall be considered "Insolvent" for purposes of this Trust Agreement if
(i) Sponsor is unable to pay its debts as they become due, or (ii) Sponsor is
subject to a pending proceeding as a debtor under the United States Bankruptcy
Code.

             (b)  All times during the continuance of this Trust, the principal
and income of the Trust shall be subject to claims of general creditors of the
Sponsor under federal and state law as set forth below.

                  (i)   The Board of Directors and the Chief Executive Officer
of the Sponsor shall have the duty to inform Trustee in writing of Sponsor's
Insolvency. If a person claiming to be a creditor of the Sponsor alleges in
writing to Trustee that Sponsor has become Insolvent, Trustee shall determine
whether Sponsor is Insolvent and, pending such determination, Trustee shall
discontinue disbursements for payment of benefits to Participants or their
beneficiaries.

                  (ii)  Unless Trustee has actual knowledge of Sponsor's
Insolvency, or has received notice from Sponsor or a person claiming to be a
creditor alleging that Sponsor is Insolvent, Trustee shall have no duty to
inquire whether Sponsor is Insolvent. Trustee may in all events rely on such
evidence concerning Sponsor's solvency as may be furnished to Trustee and that
provides Trustee with a reasonable basis for making a determination concerning
Sponsor's solvency.

                  (iii) If at any time Trustee has determined that Sponsor is
Insolvent, Trustee shall discontinue disbursements for payments to Participants
or their beneficiaries and shall hold the assets of the Trust for the benefit of
Sponsor's general creditors. Nothing in this Trust Agreement shall in any way
diminish any rights of Participants or their beneficiaries to pursue their
rights as general creditors of Sponsor with respect to benefits due under the
Plan or otherwise.

                  (iv)  Trustee shall resume disbursement for the payment of
benefits to Plan Participants or their beneficiaries in accordance with this
Agreement only after Trustee has determined that Sponsor is not Insolvent (or is
no longer Insolvent).

                                       12
<Page>

             (c)  All Electronic Products shall be provided to the Sponsor
without any express or implied legal warranties or acceptance of legal liability
by the Trustee, and all Electronic Services shall be provided to the Sponsor
without acceptance of legal liability related to or arising out of the
electronic nature of the delivery or provision of such Services. Except as
otherwise stated in this Agreement, no rights are conveyed to any property,
intellectual or tangible, associated with the contents of the Electronic
Products or Services and related material. The Trustee hereby grants to the
Sponsor a non-exclusive, non-transferable revocable right and license to use the
Electronic Products and Services in accordance with the terms and conditions of
this Agreement.

             (d)  To the extent that any Electronic Products or Services utilize
Internet services to transport data or communications, the Trustee will take,
and Sponsor agrees to follow, reasonable security precautions, however, the
Trustee disclaims any liability for interception of any such data or
communications. The Trustee reserves the right not to accept data or
communications transmitted via electronic media by the Sponsor or a third party
if it determines that the media does not provide adequate data security, or if
it is not administratively feasible for the Trustee to use the data security
provided. The Trustee shall not be responsible for, and makes no warranties
regarding access, speed or availability of Internet or network services, or any
other service required for electronic communication. The Trustee shall not be
responsible for any loss or damage related to or resulting from any changes or
modifications to the Electronic Products or Services after delivering it to the
Sponsor.

SECTION 16. GENERAL.

             (a)  PERFORMANCE BY TRUSTEE, ITS AGENTS OR AFFILIATES. The Sponsor
acknowledges and authorizes that the services to be provided under this
Agreement shall be provided by the Trustee, its agents or affiliates, including
but not limited to Fidelity Investments Institutional Operations Company, Inc.
or its successor, and that certain of such services may be provided pursuant to
one or more other contractual agreements or relationships.

             (b)  ENTIRE AGREEMENT. This Agreement contains all of the terms
agreed upon between the parties with respect to the subject matter hereof.

             (c)  WAIVER. No waiver by either party of any failure or refusal to
comply with an obligation hereunder shall be deemed a waiver of any other or
subsequent failure or refusal to so comply.

             (d)  SUCCESSORS AND ASSIGNS. The stipulations in this Agreement
shall inure to the benefit of, and shall bind, the successors and assigns of the
respective parties.

                                       14
<Page>

             (e)  PARTIAL INVALIDITY. If any term or provision of this Agreement
or the application thereof to any person or circumstances shall, to any extent,
be invalid or unenforceable, the remainder of this Agreement, or the application
of such term or provision to persons or circumstances other than those as to
which it is held invalid or unenforceable, shall not be affected thereby, and
each term and provision of this Agreement shall be valid and enforceable to the
fullest extent permitted by law.

             (f)  SECTION HEADINGS. The headings of the various sections and
subsections of this Agreement have been inserted only for the purposes of
convenience and are not part of this Agreement and shall not be deemed in any
manner to modify, explain, expand or restrict any of the provisions of this
Agreement.

SECTION 17. ASSIGNMENT. This Agreement, and any of its rights and obligations
hereunder, may not be assigned by any party without the prior written consent of
the other party(ies), and such consent may be withheld in any party's sole
discretion. Notwithstanding the foregoing, Trustee may assign this Agreement in
whole or in part, and any of its rights and obligations hereunder, to a
subsidiary or affiliate of Trustee without consent of the Sponsor. All
provisions in this Agreement shall extend to and be binding upon the parties
hereto and their respective successors and permitted assigns.

SECTION 18. FORCE MAJEURE. No party shall be deemed in default of this Agreement
to the extent that any delay or failure in performance of its obligation(s)
results, without its fault or negligence, from any cause beyond its reasonable
control, such as acts of God, acts of civil or military authority, embargoes,
epidemics, war, riots, insurrections, fires, explosions, earthquakes, floods,
unusually severe weather conditions, power outages or strikes. This clause shall
not excuse any of the parties to the Agreement from any liability which results
from failure to have in place reasonable disaster recovery and safeguarding
plans adequate for protection of all data each of the parties to the Agreement
are responsible for maintaining for the Plan.

                                       15
<Page>

SECTION 19. CONFIDENTIALITY. Both parties to this Agreement recognize that in
the course of implementing and providing the services described herein, each
party may disclose to the other confidential information. All such confidential
information, individually and collectively, and other proprietary information
disclosed by either party shall remain the sole property of the party disclosing
the same, and the receiving party shall have no interest or rights with respect
thereto if so designated by the disclosing party to the receiving party. Each
party agrees to maintain all such confidential information in trust and
confidence to the same extent that it protects its own proprietary information,
and not to disclose such confidential information to any third party without the
written consent of the other party. Each party further agrees to take all
reasonable precautions to prevent any unauthorized disclosure of confidential
information. In addition, each party agrees not to disclose or make public to
anyone, in any manner, the terms of this Agreement, except as required by law,
without the prior written consent of the other party.

SECTION 20. GOVERNING LAW.

             (a)  MASSACHUSETTS LAW CONTROLS. This Agreement is being made in
the Commonwealth of Massachusetts, and the Trust shall be administered as a
Massachusetts trust. The validity, construction, effect, and administration of
this Agreement shall be governed by and interpreted in accordance with the laws
of the Commonwealth of Massachusetts, except to the extent those laws are
superseded under Section 514 of ERISA.

             (b)  TRUST AGREEMENT CONTROLS. The Trustee is not a party to the
Plan, and in the event of any conflict between the provisions of the Plan and
the provisions of this Agreement, the provisions of this Agreement shall
control.

                                       16
<Page>

IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be executed
by their duly authorized officers as of the day and year first above written.

                     PLAN SPONSOR NAME: SAFETY INSURANCE COMPANY
                                        ----------------------------------------

                                        BY:    /s/ William J. Begley, Jr
                                               ---------------------------------

                                        NAME:  WILLIAM J. BEGLEY, JR
                                               ---------------------------------

                                        TITLE: VP, TREASURER, CFO
                                               ---------------------------------

                                        DATE:      12/11/03
                                               ---------------------------------

                                        FIDELITY MANAGEMENT TRUST COMPANY

                                        BY:        /s/ Glen J. Kindness
                                               ---------------------------------

                                        NAME:        Glen J. Kindness
                                               ---------------------------------

                                        TITLE:     Authorized Signatory
                                               ---------------------------------

                                        DATE:      December 19-2003
                                               ---------------------------------

                                       17
<Page>

IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be executed
by their duly authorized officers as of the day and year first above written.

                     PLAN SPONSOR NAME: SAFETY INSURANCE COMPANY
                                        ----------------------------------------

                                        BY:    /s/ William J. Begley, Jr
                                               ---------------------------------

                                        NAME:  WILLIAM J. BEGLEY, JR
                                               ---------------------------------

                                        TITLE: VP, TREASURER, CFO
                                               ---------------------------------

                                        DATE:      12/11/03
                                               ---------------------------------

                                        FIDELITY MANAGEMENT TRUST COMPANY

                                        BY:        /s/ Glen J. Kindness
                                               ---------------------------------

                                        NAME:        Glen J. Kindness
                                               ---------------------------------

                                        TITLE:     Authorized Signatory
                                               ---------------------------------

                                        DATE:      December 19, 2003
                                               ---------------------------------

                                       18

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