Document:

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                                                                  Exhibit 4.6

                          REGISTRATION RIGHTS AGREEMENT

         This Registration Rights Agreement, dated as of this 12th day of
October, 2000 (this "Agreement"), is by and among PRI Automation, Inc., a
Massachusetts corporation ("Parent"), and John Tenney (the "Shareholder").

         WHEREAS, pursuant to an Agreement and Plan of Merger dated as of
October 12, 2000, by and among Parent, CTI Acquisition Corp., a Massachusetts
corporation and subsidiary of Parent ("Merger Sub"), Commotion Technology, Inc.,
a California corporation (the "Company'), and the Shareholder (the "Merger
Agreement"), the parties thereto have agreed, subject to the terms and
conditions set forth therein, to merge the Company with and into Merger Sub (the
"Merger") and thereby to convert all shares of Company Common Stock (as such
term is defined in the Merger Agreement) then outstanding into shares of Parent
Stock (as such term is defined in the Merger Agreement);

         WHEREAS, pursuant to a Stock Repurchase Agreement dated as of October
12, 2000 by and between Parent and the Shareholder (the "Stock Repurchase
Agreement"), the shares of Parent Stock received by the Shareholder will be
subject to certain transfer restrictions and a right of repurchase by Parent
until such shares have become Vested Shares (as defined in the Stock Purchase
Agreement);

         WHEREAS, the Shareholder desires to have liquidity with respect to the
shares of Parent Stock he receives in the Merger;

         WHEREAS, Parent desires to grant the Shareholder registration rights as
provided herein; and

         NOW, THEREFORE, in consideration of the premises and the mutual
covenants and agreements herein contained, the parties agree as follows:

         1. DEFINITIONS OF CERTAIN TERMS. As used herein, the following terms
         shall have the following meanings:

         Exchange Act: the Securities Exchange Act of 1934, as amended, and the
         rules and regulations of the SEC issued thereunder, as they may, from
         time to time, be in effect.

         Holder: the Shareholder, so long as he holds Registerable Shares, and
         any other person or entity holding Registerable Shares to whom the
         registration rights granted in this Agreement have been transferred
         pursuant to Section 9 hereof.

         Registerable Shares: the shares of Parent Stock issued to the
         Shareholder pursuant to the Merger, and any other securities issued by
         Parent as a dividend or other distribution with respect to, or in
         exchange for or in replacement of, such shares; PROVIDED, HOWEVER,
         Registerable Shares shall not include shares of Parent Stock that (a)
         have been registered under the Securities Act and disposed of pursuant
         to the registration statement used to effect such registration, (b)
         have
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         been sold in the public securities markets in the United States of
         America, (c) are eligible to be sold under Rule 144 under the
         Securities Act, or (d) will not, by the terms of the Stock Repurchase
         Agreement, become Vested Shares before such shares will be eligible to
         be sold under Rule 144.

         SEC: the United States Securities and Exchange Commission, or any
         governmental agency succeeding to its functions.

         Securities Act: the Securities Act of 1933, as amended, and the rules
         and regulations of the SEC issued thereunder, as they may, from time to
         time, be in effect.

         Capitalized terms used, but not otherwise defined, in this Agreement
shall have the meanings given to them in the Merger Agreement.

         Where this Agreement requires Parent to use "best efforts" to satisfy
an obligation or requirement under this Agreement, the parties agree that this
shall not require Parent to make any payment that would not ordinarily be made
in the course of filing, and seeking and maintaining the effectiveness of, a
registration statement similar to the Shelf Registration (as hereinafter
defined).

         2. SHELF REGISTRATION. Parent agrees that, within forty-five (45) days
of the Closing of the Merger, it shall cause to be filed a registration
statement (a "Shelf Registration") on Form S-3 under the Securities Act for an
offering to be made on a delayed or continuous basis pursuant to Rule 415
thereunder or any similar rule that may be adopted by the SEC and permitting
sales in ordinary course brokerage or dealer transactions not involving any
underwritten public offering covering all of the Registerable Shares. Parent
shall use best efforts thereafter (a) to cause the Shelf Registration to be
declared effective by the SEC and (b) subject to Section 3 hereof, to keep the
Shelf Registration continuously effective until the earlier of (i) the first
date on which no Registrable Shares originally covered by the Shelf Registration
shall constitute Registrable Shares, or (ii) the first anniversary of the
Closing (such period is referred to herein as the "Registration Period").

         3. REGISTRATION PROCEDURES. After Parent commences the registration of
the Registrable Shares pursuant to the Shelf Registration, Parent shall:

            (a) furnish to the Holder such number of copies of the Shelf
Registration, each amendment and supplement thereto (in each case including all
exhibits thereto), the prospectus included in the Shelf Registration (including
any preliminary prospectus) and such other documents as the Holder may
reasonably request in order to facilitate the disposition of the Registrable
Shares owned by the Holder;

            (b) use best efforts to register or qualify such Registrable Shares
under such other securities or "blue sky" laws of such jurisdictions as the
Holder reasonably requests in writing and to do any and all other acts and
things that may be reasonably necessary or advisable to register or qualify for
sale in such jurisdictions the Registrable Shares owned by the Holder; PROVIDED,
HOWEVER, that Parent shall not be required (i) to

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qualify to do business in any jurisdiction where it is not then so qualified or
(ii) to consent to general service of process in any jurisdiction where it is
not then so subject to service of process; and

            (c) use best efforts to cause all Registrable Shares covered by the
Shelf Registration to be listed on the primary securities exchange or market, if
any, on which similar securities issued by Parent are then listed, PROVIDED that
the applicable listing requirements are satisfied.

         4. PARENT REGISTRATION.

            (a) At any time during the Registration Period that the Shelf
Registration is not effective under Section 2, the Holder shall have the
following rights under this Section 4. If Parent shall determine to register any
shares of Company Common Stock in addition to the shares of Company Common Stock
registered pursuant to the Shelf Registration either for its own account or the
account of a security holder or holders exercising their respective demand
registration rights, other than a registration relating solely to employee
benefit plans, or a registration relating solely to a Rule 145 transaction, or a
registration on any registration form that does not permit secondary sales,
Parent will:

                (i) promptly give to the Holder written notice thereof pursuant
to Section 14; and

                (ii) use its best efforts to include in such registration (and
any related qualification under blue sky laws or other compliance), and in any
underwriting involved therein, all the Registrable Shares specified in a written
request or requests, made by the Holder and received by Parent within ten (10)
days after the written notice from Parent described in clause (i) above is
mailed or delivered by Parent. Such written request may specify all or a part of
the Holder's Registrable Shares.

             (b) If the registration of which Parent gives notice is for a
registered public offering involving an underwriting, Parent shall so advise the
Holder as a part of a written notice given pursuant to Section 14. In such
event, the right of any Holder to registration pursuant to this Section 4 shall
be conditioned upon such Holder's participation in such underwriting and the
inclusion of such Holder's Registrable Shares in the underwriting to the extent
provided herein. Should Holder wish to participate in such a registration, The
Holder agrees that he shall (together with Parent and the other holders of
securities of Parent with registration rights to participate therein
distributing their securities through such underwriting) enter into an
underwriting agreement in customary form with the representative of the
underwriter or underwriters selected by Parent.

             (c) Notwithstanding any other provision of this Section 4 if the
representative of the underwriters advises Parent in writing that marketing
factors require a limitation on the number of shares to be underwritten, the
representative may exclude all Registrable Shares from, or limit the number of
Registrable Shares to be included in, the registration and underwriting. If the
offering of Parent's securities are to the general public, Parent

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may limit, to the extent so advised by the underwriters, the amount of
securities to be included in the registration by Parent's shareholders
(including the Holder); provided, however, that the aggregate value of
securities to be included in such registration by Parent's shareholders
(including the Holder) may not be so reduced to less than twenty-five percent
(25%) of the total value of all securities included in such registration. Parent
shall so advise the Holder, and the number of shares of securities that are
entitled to be included in the registration and underwriting shall be allocated
first to Parent for securities being sold for its own account and thereafter as
set forth herein. If any person does not agree to the terms of any such
underwriting, he shall be excluded therefrom by written notice from Parent or
the underwriter. Any Registrable Shares or other securities excluded or
withdrawn from such underwriting shall be withdrawn from such registration.

         5. STOP ORDER; SUPPLEMENT TO THE PROSPECTUS; PARENT'S INSIDER TRADING
POLICIES.

             (a) Parent will notify the Holder promptly of (i) the issuance of
any stop order suspending the effectiveness of the Shelf Registration or the
institution or threatening of any proceeding for such purpose or (ii) the
receipt by Parent of any notification with respect to the suspension of the
qualification of the Registrable Shares for sale in any jurisdiction or the
initiation or threatening of any proceeding for such purpose. Immediately upon
receipt of any such notice, the Holder shall cease to offer and sell any
Registrable Shares pursuant to the Shelf Registration in the jurisdiction to
which such stop order or suspension relates. Parent shall use best efforts to
prevent the issuance of any such stop order or the suspension of any such
qualification and, if any such stop order is issued or any such qualification is
suspended, to obtain as soon as possible the withdrawal or revocation thereof,
and will notify the Holder at the earliest practicable date of the date on which
the Holder may offer and sell Registrable Shares pursuant to the Shelf
Registration.

             (b) Parent will notify the Holder promptly of the occurrence of any
event or the existence of any state of facts that, in the judgment of Parent,
should be set forth in the prospectus used in connection with the Shelf
Registration (the "Prospectus"). Immediately upon receipt of such notice, the
Holder shall cease to offer or sell any Registrable Shares pursuant to such
Prospectus, cease to deliver or use such Prospectus and, if so requested by
Parent, return to Parent, at its expense, all copies (other than permanent file
copies) of such Prospectus. Parent will, as soon as the information becomes
available in a form such that it may be included in an amendment or supplement
to the Prospectus, use best efforts to amend or supplement such Prospectus in
order to set forth or reflect such event or state of facts; IT BEING UNDERSTOOD
that in the event that Parent determines in good faith that the disclosure of
such information would be seriously detrimental to Parent or its shareholders,
Parent shall be permitted to delay the filing of such an amendment or supplement
to the Prospectus for a period of time to extend no longer than forty-five (45)
days. Parent will furnish copies of such amendment or supplement to the
Prospectus to the Holder.

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             (c) The Holder agrees, if and for so long as the Holder is an
employee of Parent or any of Parent's Subsidiaries, to comply with any Parent
policy concerning the purchase and sale of securities of Parent.

         6. INFORMATION CONCERNING THE SELLERS.

         (a) The obligations of Parent to take actions contemplated by Sections
2, 3 and 4 hereof with respect to an offering of Registrable Shares shall be
subject to the condition that the Holder shall (i) conform to all applicable
requirements of the Securities Act and the Exchange Act with respect to the
offering and sale of securities and (ii) advise each underwriter, broker or
dealer through which any of such Registrable Shares are offered that such
Registrable Shares are part of a distribution that is subject to the prospectus
delivery requirements of the Securities Act, and the Holder shall furnish to
Parent in writing such information and furnish such documents as may be
reasonably required by Parent in the preparation of (A) the Prospectus (or any
amendment or supplement thereto) with respect to such offering and (B) any
qualification of such Registrable Shares under state securities or "blue sky"
laws pursuant to Section 3(b) hereof, and shall promptly notify Parent of the
occurrence, from the date on which such information or documents are furnished
to the date of the closing for the sale of such Registrable Shares, of any event
relating to the Holder that is required under the Securities Act to be set forth
in the Prospectus (or any amendment or supplement thereto).

         (b) At the end of the Registration Period the Holder shall discontinue
sales of Registrable Shares pursuant to the Shelf Registration after Parent has
given notice to the Holder of its intention to remove from registration the
securities covered by the Registration Statement which remain unsold, and the
Holder shall notify Parent immediately upon receipt of such notice from Parent
of the number of shares of the Holder that are registered but remain unsold.

         7. EXPENSES OF REGISTRATION. Parent shall pay all reasonable expenses
incident to its performance of or compliance with this Agreement and
registration of Registrable Shares in connection herewith, including (a) all
SEC, stock exchange or market and National Association of Securities Dealers,
Inc. registration and filing fees, (b) all fees and expenses incurred in
complying with securities or "blue sky" laws, (c) all printing, messenger and
delivery expenses, (d) all fees and disbursements of Parent's independent public
accountants and counsel, and (e) the reasonable fees and expenses of one counsel
to the Holder, not to exceed $2,500 (all of such expenses herein referred to s
"Registration Expenses"). The Registration Expenses shall not include any sales
or underwriting discounts, commissions or fees attributable to the sale of the
Registrable Shares, which shall be borne by the Holder.

         8. DISCLOSURE. With a view to making available registration on Form S-3
and the benefits of Rule 144 under the Securities Act, Parent agrees to:

         (a) Make and keep current public information available within the
meaning of Rule 144(c).

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         (b) File with the SEC in a timely manner all reports and other
documents and information required of Parent under the Exchange Act, and take
such other actions as may be necessary to assure the availability of Form S-3
for use in connection with the registration rights provided in this Agreement.

         (c) Furnish to the Holder forthwith upon request a written statement as
to Parent's compliance with the reporting requirements of Rule 144 and the
Exchange Act, a copy of Parent's most recent annual and quarterly reports, and
such other reports, documents and other information in the possession of or
reasonably obtainable by Parent as the Holder may reasonably request in availing
itself of Rule 144.

         9. INDEMNIFICATION AND CONTRIBUTION.

         (a) Parent agrees to indemnify, to the extent permitted by law and
subject to the terms of this Agreement, the Holder and each person, if any, who
controls the Holder (within the meaning of the Securities Act) against any
losses, claims, damages, liabilities and expenses (including reasonable
attorneys' fees) arising out of or based upon any untrue or alleged untrue
statement of a material fact contained in the Shelf Registration (or any
amendment thereto) or the Prospectus (or any amendment or supplement thereto) or
any omission or alleged omission to state therein a material fact required to be
stated therein or necessary to make the statements made therein in the light of
the circumstances under which they were made not misleading; PROVIDED, HOWEVER,
that Parent shall not be liable to the Holder and each person, if any, who
controls the Holder (within the meaning of the Securities Act) to the extent
that any such loss, claim, damage, liability or expense arises out of, or is
based upon any untrue or alleged untrue statement, or any omission, if such
statement or omission shall have been made in reliance upon and in conformity
with information relating to the Holder or person furnished in writing to Parent
by any the Holder or person expressly for use in the preparation of the Shelf
Registration (or any amendment thereto) or the Prospectus (or any amendment or
supplement thereto).

         (b) In connection with the Shelf Registration, the Holder agrees to
indemnify, to the extent permitted by law and subject to the terms of this
Agreement, Parent, its directors, officers, employees and agents and each person
who controls Parent (within the meaning of the Securities Act) against any
losses, claims, damages, liabilities and expenses (including reasonable
attorneys' fees) arising out of or based upon any untrue or alleged untrue
statement of a material fact contained in the Shelf Registration (or any
amendment thereto) or the Prospectus (or any amendment or supplement thereto) or
any omission or alleged omission to state therein a material fact required to be
stated therein or necessary to make the statements made therein in the light of
the circumstances under which they were made not misleading, to the extent that
such untrue statement or omission was made in reliance upon and in conformity
with information furnished in writing to Parent by the Holder expressly for use
in the preparation of the Shelf Registration (or any amendment thereto) or the
Prospectus (or any amendment or supplement thereto).

         (c) Each party entitled to indemnification under this Section 8 shall
give notice to the party required to provide indemnification promptly after such
indemnified

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party has actual knowledge of any claim as to which indemnity may be sought, and
shall permit the indemnifying party to assume the defense of any such claim or
any litigation resulting therefrom; PROVIDED that counsel for the indemnifying
party, who shall conduct the defense of such claim or litigation, shall be
approved by the indemnified party (whose approval shall not be unreasonably
withheld or delayed); and PROVIDED, FURTHER, that the delay or failure of any
indemnified party to give notice as provided herein shall not relieve the
indemnifying party of its obligations under this Section 8, except to the extent
that the indemnifying party shall have been materially adversely affected by
such delay or failure. The indemnified party may participate in such defense at
such party's expense; PROVIDED, HOWEVER, that the indemnifying party shall pay
such expense if the indemnified party shall have reasonably concluded that there
may be a conflict between the positions of the indemnifying party and the
indemnified party in conducting the defense of any such claim or litigation
resulting therefrom. No indemnified party shall consent to entry of any judgment
or settle any claim or litigation without the prior written consent of the
indemnifying party.

         (d) If the indemnification provided for in this Section 8 from the
indemnifying party is unavailable to an indemnified party hereunder in respect
of any losses, claims, damages, liabilities or expenses referred to therein as a
result of a judicial determination that such indemnification may not be enforced
in such case notwithstanding this Agreement, the indemnifying party, in lieu of
indemnifying such indemnified party, shall contribute to the amount paid or
payable by such indemnified party as a result of such losses, claims, damages,
liabilities or expenses in such proportion as is appropriate to reflect the
relative fault of the indemnifying party and indemnified parties in connection
with the actions which resulted in such losses, claims, damages, liabilities or
expense, as well as any other relevant equitable considerations. The relative
fault of such indemnifying party and indemnified parties shall be determined by
reference to, among other things, whether any action in question, including any
untrue or alleged untrue statement of material fact or omission or alleged
omission to state a material fact, has been made by, or relates to information
supplied by, such indemnifying party or indemnified parties, and the parties'
relative intent, knowledge, access to information and opportunity to correct or
prevent such action. No person guilty of fraudulent misrepresentation (within
the meaning of Section 11(f) of the Securities Act) shall be entitled to
contribution from any person who was not guilty of such fraudulent
misrepresentation.

         10. TRANSFER OF REGISTRATION RIGHTS. The registration rights of the
Holder (and of any transferee of the Holder or its transferees) under this
Agreement with respect to any Registrable Shares may be transferred to any
transferee of such Registrable Shares; PROVIDED that Parent is given written
notice by the Holder at the time of such transfer stating the name and address
of the transferee and identifying the Registrable Shares with respect to which
the rights under this Agreement are being assigned and such transferee executes
and delivers such agreements as Parent may reasonably require in order to
confirm that such transferee agrees to be bound by this Agreement.

         11. AMENDMENTS AND SUPPLEMENTS. This Agreement may not be amended,
modified or supplemented by the parties hereto in any manner, except by an
instrument in writing signed by Parent and the Shareholder.

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         12. NO WAIVER. The terms and conditions of this Agreement may be waived
only by a written instrument signed by (a) the Shareholder in the case where the
Shareholder is waiving compliance and (b) by Parent in the case where Parent is
waiving compliance. The failure of any party hereto to enforce at any time any
of the provisions of this Agreement shall in no way be construed to be a waiver
of any such provision, nor in any way to affect the validity of this Agreement
or any part hereof or the right of such party thereafter to enforce each and
every such provision. No waiver of any breach of or non-compliance with this
Agreement shall be held to be a waiver of any other or subsequent breach or
non-compliance. The rights and remedies herein provided are cumulative and are
not exclusive of any rights or remedies that any party may otherwise have at law
or in equity.

         13. GOVERNING LAW. This Agreement shall be governed by, and construed
and enforced in accordance with, the substantive laws of the Commonwealth of
Massachusetts, without regard to its principles of conflicts of laws.

         14. NOTICE. All notices and other communications hereunder shall be in
writing and shall be deemed given if delivered by hand, sent by facsimile
transmission with confirmation of receipt, sent via a reputable overnight
courier service with confirmation of receipt requested, or mailed by registered
or certified mail (postage prepaid and return receipt requested) to the parties
at the following addresses (or at such other address for a party as shall be
specified by like notice), and shall be deemed given on the date on which
delivered by hand or otherwise on the date of receipt as confirmed:

         TO PARENT:

                  PRI Automation, Inc.
                  805 Middlesex Turnpike
                  Billerica, Massachusetts 01821
                  Facsimile: (508) 671-9430
                  Attention: President

         With a copy to:

                  Robert L. Birnbaum, Esq.
                  Foley, Hoag & Eliot LLP
                  One Post Office Square
                  Boston, Massachusetts 02109
                  Facsimile: (617) 832-7000

         TO THE HOLDER:

                  John Tenney
                  1412 Grand Avenue
                  Piedmont, California  94610

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         With a copy to:

                  Kevin W. Finck
                  Two Embarcadero Center, Ste. 1670
                  San Fransisco, California  94111
                  Facsimile:  (415) 394-6446

         15. CONSTRUCTION OF AGREEMENT. A reference to a Section shall mean a
Section in this Agreement unless otherwise expressly stated. The titles and
headings herein are for reference purposes only and shall not in any manner
limit the construction of this Agreement which shall be considered as a whole.
The words "include," "includes" and "including" when used herein shall be deemed
in each case to be followed by the words "without limitation."

         16. ENTIRE AGREEMENT, ASSIGNABILITY, ETC.. This Agreement and the
Merger Agreement and the documents and other agreements among the parties hereto
and thereto as contemplated by or referred to herein or therein constitute the
entire agreement among the parties with respect to the subject matter hereof and
supersede all other prior agreements and understandings, both written and oral,
between the parties with respect to the subject matter hereof. This Agreement
shall be binding upon and inure to the benefit of the parties hereto and their
respective successors and permitted assigns. This Agreement is not intended to
confer upon any person other than the parties hereto any rights or remedies
hereunder, except as otherwise expressly provided herein and shall not be
assignable by operation of law or otherwise, except as provided in Section 9
hereof.

         17. VALIDITY. The invalidity or unenforceability of any provision of
this Agreement shall not affect the validity or enforceability of any other
provision of this Agreement, each of which shall remain in full force and
effect.

         18. COUNTERPARTS. This Agreement may be executed in one or more
counterparts, all of which together shall constitute one and the same Agreement.

         19. PROFESSIONAL FEES. In the event of the bringing of any claim,
action, suit or arbitration by a party hereto against another party hereunder by
reason of any breach of any of the covenants, agreements, or provisions arising
out of this Agreement, the prevailing party shall be entitled to recover all
costs and expenses of that claim, action, suit or arbitration, at trial,
arbitration or on appeal and in collection of judgment, including but not
limited to reasonable attorneys', accounting, and other professional fees
resulting therefrom.

                                    * * * * *

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         IN WITNESS WHEREOF, the parties have caused this Registration Rights
Agreement to be executed as an agreement under seal as of the date first written
above.

                                                   PRI AUTOMATION, INC.

                                                   By: /s/ Cosmo Trapani
                                                       ------------------------
                                                       Title: VP & CFO

                                                       /s/ John Tenney
                                                       ------------------------
                                                       John Tenney

                                      -10-EXHIBIT 10.5

     AGREEMENT TO REDEEM MEMBERSHIP INTEREST, TRANSFER INTELLECTUAL PROPERTY
                       AND AMEND ASSET PURCHASE AGREEMENT

     THIS  AGREEMENT  TO  REDEEM  MEMBERSHIP  INTEREST,   TRANSFER  INTELLECTUAL
PROPERTY AND AMEND ASSET PURCHASE  AGREEMENT  ("Agreement") is made by and among
TRAFFIC SYSTEMS,  L.L.C., an Arizona limited liability company ("Buyer"),  UNITY
WIRELESS  SYSTEMS  CORPORATION,  a  corporation  incorporated  under the laws of
British  Columbia  ("Seller"),   TRAFFIC  SAFETY  PRODUCTS,   INC.,  an  Arizona
corporation  ("TSP"),  and JIM HILL  ("Hill"),  effective  the 9th day of April,
2001.

                                    RECITALS:

     A.   The  parties  hereto  are  parties  to  that  certain  Asset  Purchase
          Agreement,   dated  October  6,  2000  ("Asset  Purchase  Agreement"),
          whereby,  among other  things,  Seller sold  certain  assets to Buyer,
          licensed  certain  intellectual  property  to  Buyer  and  received  a
          thirty-seven  percent (37%)  interest in Buyer (the  "Interest").  The
          intellectual  property is more  specifically  described in Exhibit "A"
          attached hereto ("Intellectual Property").

     B.   One of the parties to the Asset Purchase  Agreement,  568608 B.C. Ltd.
          has merged with Seller, with Seller the surviving corporation; and

     C.   Seller  desires to  transfer  all the  Interest  and the  Intellectual
          Property  to  Buyer,  subject  to the  terms  and  conditions  of this
          Agreement.

AGREEMENT:

     NOW,  THEREFORE,  in consideration of the mutual promises  contained herein
and other good and valuable consideration,  the receipt and sufficiency of which
is hereby acknowledged, the parties agree as follows:

     1. Redemption of Seller's Interest. Buyer hereby redeems the Interest.

     2.  Transfer  of the  Intellectual  Property.  Seller  assigns to Buyer the
Intellectual  Property,  effective April 30, 2001. Concurrent with the execution
of this  Agreement,  Seller  and  Buyer  agree to enter  into an  Assignment  of
Intellectual  Property, in the form attached hereto as Exhibit "B". Buyer agrees
to pay all costs  associated with the assignment of the  Intellectual  Property,
including  any related  patent  office  fees.  Buyer  accepts  the  Intellectual
Property "as is".

     3. Amendment and Restatement of Subparagraph  6(a) and Paragraph 7 of Asset
Purchase Agreement.  Subparagraph 6(a) of the Asset Purchase Agreement is hereby
amended and restated in its entirety to read as follows:

          "a.  All   obligations  to  perform  any  work  required  on  existing
               installations  of Sonem  preemption  products  necessary to bring
               such  installations into compliance with the terms of the written
               warranty provided by Seller with respect to such products and for
               any work required at common law on such  installations,  all such
               work with  respect to a  specific  installation  to be  completed
               within a reasonable time after Buyer receives written notice that
               such  installation  is  not  in  compliance  with  such  warranty
               provisions or common law; and"

     Paragraph 7 of the Asset Purchase  Agreement is hereby amended and restated
     in its entirety to read as follows:

          "7.  Release. Buyer hereby releases and discharges each of Seller, its
               successors  and  assigns,  from all  actions,  causes of  action,
               suits, debts, dues, sums of money, accounts,  reckonings,  bonds,
               bills,   specialties,    covenants,   contracts,   controversies,
               agreements, promises, variances, trespasses,

<PAGE>

               damages,  judgments,  extents,  executions,  claims  and  demands
               whatsoever,   in  law  or  equity,   which  against  Seller,  its
               successors  and assigns any of Buyer,  its successors and assigns
               ever  had,  now have or  hereafter  can,  shall or may  have,  in
               connection  with the work  obligations  referred to in  paragraph
               6(a) above."

     4. Representations and Warranties.

Seller represents and warrants as follows:

          a.   Seller has the full power and right to enter into this  Agreement
               and to  consummate  the sale and transfer of the Interest and the
               Intellectual Property, free and clear of any option,  commitment,
               lien or other encumbrance.

          b.   Buyer shall receive good and marketable title to the Interest.

          c.   Seller has provided  Buyer with copies of all written  notices of
               required  or  requested  warranty  work with  respect to existing
               installations  of Sonem preemption  products,  and Seller has not
               received any other such notices orally.

          d.   Attached  hereto as Exhibit "C" is a true and correct copy of the
               written  warranty  referred to in subparagraph  6(a) of the Asset
               Purchase Agreement, as amended hereby.

Buyer represents and warrants as follows:

          a.   Buyer has sent the letter  attached  as Exhibit  "D" to all Sonem
               distributors.

          b.   Buyer will send a letter  containing  wording  similar to that in
               Exhibit "E" to all Sonem distributors on or before April 15, 2001

     5.  Indemnification.  Buyer agrees to indemnify Seller from and against all
claims, damages, costs and liabilities suffered by Seller in connection with the
debts,  obligations and liabilities identified in subparagraph 6(a) of the Asset
Purchase Agreement,  as amended hereby, within a reasonable time after receiving
written  notice  thereof.  Seller  agrees to indemnify,  defend,  and hold Buyer
harmless  from any  damages,  costs or  liabilities  incurred as a result of the
falsity of any representation made by Seller under this Agreement.

     6. Payment of Purchase Price.

          a. In the event of a sale of Buyer,  either through the sale of all or
substantially all of its assets which it acquired from Seller as a result of the
Asset Purchase  Agreement  and/or this Agreement,  or a transaction or series of
related  transactions  pursuant  to which the  members of Buyer cease to own the
majority of the  outstanding  membership  interest  of Buyer or its  acquirer or
successor (any such sale of Buyer,  a "Sale"),  in which the cash purchase price
payable to Buyer or TSP upon  completion  of the Sale is at least  US$2,500,000,
Seller  shall  become  entitled to receive the  remaining  balance of the amount
described  in  Paragraph  2(b) of the  Asset  Purchase  Agreement,  within  five
business days  following  completion of the Sale or at such later time as may be
agreed between Buyer and Seller.

          b. In the event of a Sale in which the cash purchase  price payable to
Buyer or TSP upon completion of the Sale is less than  US$2,500,000,  Seller, on
the one hand, and Buyer or TSP, on the other hand, agree to confer in good faith
prior to the closing of such Sale for the  purpose of  arriving at a  definitive
written  agreement  regarding the allocation of the purchase price between Buyer
or TSP, on the one hand, and Seller, on the other hand.

          c.  Buyer and TSP  covenant  that  neither of them will enter into any
agreement  contemplating  a Sale referred to in  subparagraph  6(b) above unless
such agreement requires, as a condition

                                       2
<PAGE>

precedent  to the  closing of such Sale,  that  Seller  shall have  executed  an
agreement  contemplated by  subparagraph  6(b) above regarding the allocation of
the purchase price in such Sale.

          d. If the terms of the payment of the  purchase  price for any Sale do
not  provide for full  payment on the  closing of such Sale,  then any such Sale
agreement  shall provide,  in addition to its other terms,  that Seller shall be
entitled to fifty percent (50%) of the purchase  price money payable to Buyer or
TSP after the closing of such Sale, when payable, until the remaining balance of
the amount described in Paragraph 2(b) of the Asset Purchase  Agreement has been
paid in full.

     7.  Asset  Purchase  Agreement.  The  parties  acknowledge  that no further
materials or monies are due from Seller to Buyer either as a result of the Asset
Purchase  Agreement or otherwise and that Seller is not obligated to provide any
technical,  development or manufacturing  support to Buyer either as a result of
the Asset Purchase Agreement or otherwise.

     8. Amendment and  Restatement of Paragraph 15 of Asset Purchase  Agreement.
Paragraph 15 of the Asset  Purchase  Agreement is hereby amended and restated in
its entirety to read as follows:

"15. The parties  acknowledge  that Seller is not  required to maintain  product
liability   insurance  on   installations   installed  after  October  6,  2000.
Notwithstanding   the  foregoing,   Seller  shall  be  solely   responsible  for
maintaining  in effect  product  liability  insurance  coverage  for all traffic
preemption  installations  existing as of October 6, 2000 and represents that it
has named Buyer as an additional insured under the relevant policy."

     9.  Closing.  The closing (the  "Closing")  of the sale and purchase of the
Interest and the Intellectual  Property shall take place at the offices of SACKS
TIERNEY P.A.  commencing  at 10:00 a.m.  local time on April 30, 2001 or at such
other time and place as the parties may agree in writing. The date of Closing is
sometimes herein referred to as the "Closing Date" or the "Closing."

     10.  Items to be  Delivered  at Closing.  At the Closing and subject to the
terms and conditions herein contained:

Seller will deliver to Buyer the following:

          (a)  duly executed Assignment of Intellectual  Property in the form of
               Exhibit B.

          (b)  duly executed Assignment by Seller to Buyer of the Interest;

Buyer will deliver to Seller the following:

          (a)  duly executed Assignment by Seller to Buyer of the Interest;

     11.  Amendments and Waivers.  Any term of this Agreement may be amended and
the  observance of any term may be waived  (either  generally or in a particular
instance and either  retroactively  or  prospectively)  only by an instrument in
writing signed by the parties.

     12.  Conflict.  In the  event of any  conflict  between  the  terms of this
Agreement  and the  terms of the  Asset  Purchase  Agreement,  the terms of this
Agreement  shall control and the Asset  Purchase  Agreement  shall be amended as
provided herein.

     13. Severability.  If any provision of this Agreement is held to be invalid
or unenforceable to any extent in any context, it shall nevertheless be enforced
to the  fullest  extent  allowed  by law in that  and  other  contexts,  and the
validity  and force of the  remainder  of this  Agreement  shall not be affected
thereby.

     14.  Governing Law. This Agreement,  including all matters of construction,
validity and  performance,  shall be governed by and  construed  and enforced in
accordance with the laws of the State of Arizona,  as applied to contracts made,
executed  and to be fully  performed  in such state by  citizens  of such state,
without regard to its choice of law and conflict of laws rules.

                                       3
<PAGE>

     15.  Interpretation.  The  headings  contained  in this  Agreement  are for
reference only and shall not affect in any way the meaning or  interpretation of
this Agreement. Whenever the word "including" is used in this Agreement it shall
be deemed to be followed by the words "without limitation."

     16.  Heirs,  Successors  and  Assigns.  The  terms and  conditions  of this
Agreement  shall  inure to the  benefit  of and be binding  upon the  respective
heirs, successors and assigns of the parties. Nothing in this Agreement, express
or implied,  is intended to confer upon any party other than the parties  hereto
or  their  respective  heirs,  successors  and  assigns  any  rights,  remedies,
obligations  or  liabilities  under or by  reason  of this  Agreement  except as
expressly provided in this Agreement.

     17.   Counterparts.   This  Agreement  may  be  executed  in  two  or  more
counterparts,  each of  which  shall be  deemed  an  original,  but all of which
together  shall  constitute  one  and the  same  agreement.  Signatures  to this
Agreement are deemed acceptable by facsimile transmission.

     18. Entire Agreement.  This Agreement, the other documents delivered at the
Closing and the Asset Purchase  Agreement as amended hereby  supersede all prior
agreements  with  respect to the subject  matter  hereof.  In  interpreting  and
construing  this  Agreement,  the fact that a particular  party may have drafted
this  Agreement  or any  provision  hereof  shall  not be given  any  weight  or
relevance.

     19. Authority.  Each party warrants that it has the authority to enter into
this  Agreement  and that the person  signing  on its  behalf,  if any,  is duly
authorized to do so.

     IN WITNESS WHEREOF, the parties herein have executed this Agreement the day
and year first above written.

                                 BUYER:

                                 TRAFFIC SYSTEMS, LLC, an Arizona limited
                                   liability company

                                 By:
                                    --------------------------------------------

                                 Its:
                                     -------------------------------------------

                                 SELLER:

                                 UNITY WIRELESS SYSTEMS CORPORATION

                                 By:
                                    --------------------------------------------

                                 Its:
                                     -------------------------------------------

                                 TRAFFIC SAFETY PRODUCTS, INC., an Arizona
                                   corporation

                                 By:
                                    --------------------------------------------

                                 Its:
                                     -------------------------------------------

                                 --------------------------------------
                                        JAMES L. HILL

                                       4
<PAGE>

                                   EXHIBIT "A"

                              INTELLECTUAL PROPERTY

A.   Seller is the owner of the following patents for siren-detector inventions:

    Country            Patent Number  Issue Date               Expiry Date
    -------            -------------  ----------               -----------
    Australia          681380         18 December, 1997       4 March, 2014
    Canada             1,322,586      28 September, 1993      28 September, 2010
    China              94195085.9     28 April, 2000          4 March, 2014
    France             EP 318668      8 January, 1997         1 October, 2008
    France             EP 748494      17 June, 1998           4 March, 2014
    Germany            P69411195.3    8 January, 1997         1 October, 2008
    Germany            EP 748494      17 June, 1998           4 March, 2014
    Hong Kong          HK1009352      28 May, 1999            4 March, 2014
    Italy              EP 318668      8 January, 1997         1 October, 2008
    New Zealand        262083         8 September, 1998       4 March, 2014
    Singapore          49839          21 December 1998        4 March, 2014
    Spain              2011597        8 January, 1997         1 October, 2008
    United Kingdom     EP 318668      8 January, 1997         1 October, 2008
    United Kingdom     EP 748494      17 June, 1998           4 March, 2014
    U.S.A.             4,864,297      5 September, 1989       14 October, 2007
    U.S.A.             5,710,555      20 January, 1998        1 March, 2014

B.   Seller  has filed  applications  to patent a  siren-detector  invention  as
     follows:

    Country            Patent Number  Issue Date               Expiry Date
    -------            -------------  ----------               -----------

    Canada             2,183,868      4 March, 1994            4 March, 2014
    Japan              7-522583       4 March, 1994            4 March, 2014

C.       Seller is the owner of the following patents for other inventions:

    Country            Patent Number  Issue Date               Expiry Date
    -------            -------------  ----------               -----------
     Audio Railway Crossing Detector:

    U.S.A.              5,910,929     8 June, 1999             10 July, 2018

    Control Signal Coding and Detection in the Audible and Inaudible Ranges:

    U.S.A.              6,133,849     17 October, 2000         20 February, 2016

                                       5
<PAGE>

                                   EXHIBIT "B"

                       ASSIGNMENT OF INTELLECTUAL PROPERTY

              [This Exhibit to be provided by Traffic Systems LLC.]

                                       6
<PAGE>

                                   EXHIBIT "C"

                            SELLER'S WRITTEN WARRANTY

Limited Warranty

     Sonic  Systems  Corporation  will repair or replace any SONEM 2000  Digital
     Siren Detector  component or components  found to be defective in materials
     and/or  workmanship  within five (5) years from the date of  shipment  from
     Sonic.  Some states and  jurisdictions do not allow limitations on duration
     of an  implied  warranty,  so the  above  limitation  may not  apply to the
     Customer.  To the extent allowed by applicable law,  implied  warranties on
     the SONEM 2000 are limited to one (1) year for hardware and  equipment  and
     to five (5) years for software  unless  altered in writing by Sonic Systems
     Corporation.

Customer Remedies

     In the event that any unit of the SONEM 2000, or any part thereof, does not
     meet  Sonic's  Limited  Warranty,  the  entire  liability  of Sonic and its
     suppliers,  directors,  officers, employees, and agents, and the Customer's
     sole remedy,  shall be, at Sonic's  option,  either:  (a) the return of the
     price paid by the Customer for the SONEM 2000 (excluding taxes, duties, and
     other  similar  charges  and  installation  costs)  or (b)  the  repair  or
     replacement  of the SONEM 2000 or any  component  part  thereof  (excluding
     taxes,  duties,  and other similar charges and  installation  costs).  This
     Limited  Warranty is void if the failure of the SONEM 2000 or any component
     part thereof has resulted from  improper  installation,  operation,  and/or
     maintenance  (including  repair or modification by persons  unauthorized by
     Sonic), accident, abuse, negligence, and/or misapplication. Any replacement
     of the SONEM 2000 or any  component  part thereof will be warranted for the
     remainder of the original warranty period or for one (1) year, whichever is
     longer.  In  jurisdictions  where Sonics  markets the SONEM 2000 through an
     authorized dealer, the above remedies will not be available to the Customer
     without proof of purchase from the authorized dealer or distributor.

No Other Warranties

     To the maximum extent  permitted by applicable law, Sonic and its suppliers
     and distributors disclaim all other warranties,  either express or implied,
     including without  limitation  implied  warranties of  merchantability  and
     fitness for a  particular  purpose  with regard to the SONEM 2000 and as to
     the validity or scope of the  technology of Sonic or that the technology or
     Sonic does not  infringe  on the  rights of any third  party.  The  limited
     warranty set out in this  agreement  provides the  customer  with  specific
     legal  rights.   The  customer  may  have  others,   which  may  vary  from
     jurisdiction to jurisdiction.

                                       7
<PAGE>

No Liability For Consequential Damages

     To the maximum extent  permitted by applicable law, in no event shall Sonic
     or its  suppliers or  distributors  be liable for any special,  incidental,
     direct,   indirect,   or  consequential   damages  or  expenses  whatsoever
     (including  without  limitation,  damages  for  loss of  business  profits,
     business interruption, loss of business information, or any other economic,
     commercial,  or pecuniary loss) arising out of the functioning or use of or
     inability  to use the SONEM  2000,  even if Sonic had been  advised  of the
     possibility  of such damages or expenses.  Liability for  consequential  or
     incidental damages and,  therefore,  the above limitations may not apply to
     the customer.

Changes to and Use of the SONEM 2000

     Sonic  reserves  the  right  to  make  any  changes  in the  design  and/or
     construction  of the SONEM 2000 or the component  parts thereof at any time
     without  incurring  any  obligation  to make any change  whatsoever  in the
     system or  components  previously  sold and  delivered.  The unit(s) of the
     SONEM 2000, and any component  parts thereof,  supplied to the Customer are
     sold for use at only the number of  intersections  specifically  recited on
     applicable purchase documents. The SONEM 2000 is covered by U.S. Patent No.
     4,864,297  and its  corresponding  foreign  applications.  Sonic  has  also
     applied for additional patent protection for improvements and modifications
     to the  SONEM2000.  Individual  components  are  sold  separately  only for
     incorporation  into the SONEM 2000 or for  replacement  purposes,  and such
     individual  component  sales  for not  grant or imply a  license  under the
     above-mentioned  patent rights, or any other  intellectual  property rights
     held by or licensed to Sonic.

                                       8

<PAGE>

                                   EXHIBIT "D"

                         BUYER'S LETTER TO DISTRIBUTORS

                             Traffic Systems, L.L.C.
                       7441 EAST BUTHERUS DRIVE, SUITE 300
                         SCOTTSDALE, ARIZONA 85260-2424
                         (480)367-9291 FAX (480)367-9633
                                 1-866-600-0003

November 17, 2000

Mr. Rob Hyslop
RGH Pacific
101, 1089 East Kent Avenue
Vancouver, BC V5X 4V9

Dear Mr. Hyslop:

Traffic  Systems  L.L.C.  has just  completed the purchase of Sonic Systems from
Unity Wireless Systems Corporation.

This letter is intended to introduce ourselves and to establish contact with the
Sonic Distributors.

Traffic Systems  purchased all of the Sonic assets from Unity Wireless  Systems.
All  contracts and purchase  orders have been  transferred  from Unity  Wireless
Systems, Corp. to Traffic Systems, L.L.C.

We would like to continue  having you as a distributor  for the Sonem 2000. Your
territory  will  remain  the same as it is now.  Sonem  2000 will  remain as the
product  name.  However  the system  has been  reconfigures  to use a  different
detector.  The  software has been  enhanced  and we have changed the  enclosure.
Pricing has not changed at the present time.

Traffic Systems L.L.C. will honor any warranty claims for the Sonem components.

The  manuals  and  brochures  are being  rewritten  and should be  available  in
approximately  two weeks. We will have E-mail when the local  telephone  company
installs a line without destroying all of our other lines.

Bear  with us for a short  time as we play  catch up and then we  should  have a
smooth operation.

Please feel free to contact any of the following people as needed:

         Jim Hill - Anything
         Harold Hayes - Technical support and Installation
         Glenda Hill - Accounting
         Brad Hill - Production and Shipping
         Steve Mahone - Sales

                                       9
<PAGE>

November 17, 2000
Mr. Hyslop
Page 2

The Traffic System group has about 100 years of traffic,  preemtion and U.S. DOT
funding experience. We are here to provide whatever assistance to you, we can.

I am looking forward to meeting with you in the not to distant  future.  We will
be working to provide all the  service  and support you need,  so we may enjoy a
mutually prosperous and beneficial relationship.

Sincerely,

Traffic Systems, LLC

James L. Hill
President

                                       10

<PAGE>

                                   EXHIBIT "E"

                      BUYER'S SECOND LETTER TO DISTRIBUTORS

Traffic  Systems  LLC will  send a letter to all  Sonem  distributors  (past and
present) with wording similar to this, to ensure that all distributors are clear
that  Traffic  Systems  has  assumed  all  warranty  responsibilities  for Sonem
products:

     When Traffic  Systems LLC purchased the Sonem  business from Unity Wireless
     Systems  Corp.  (formerly  Sonic  Systems  Inc.) in  October,  2000,  Unity
     Wireless retained a minority ownership share in Traffic Systems.

     The  transition  is now  complete,  and Traffic  Systems has bought out the
     minority ownership interest previously held by Unity Wireless.  As has been
     the  practice for the past several  months,  please  continue to direct all
     inquiries  regarding  the Sonem  products  and related  warranty  issues to
     Traffic Systems LLC; all requests  relating to the Sonem products  received
     by Unity Wireless will be redirected to Traffic Systems.

                                       11
<PAGE>

                             Traffic Systems, L.L.C.
                       7441 EAST BUTHERUS DRIVE, SUITE 300
                         SCOTTSDALE, ARIZONA 85260-2424
                         (480)367-9291 FAX (480)367-9633
                                 1-866-600-0003

April 13, 2001

Mr. Tom Camp
Camp Safety Equipment
8216 Blue Ash Road
Cincinnati, OH  45236

Dear Tom:

When Traffic Systems, L.L.C. purchased Sonem from Unity Wireless (formerly Sonic
Systems,  Inc.) last October, Unity Wireless retained a minority ownership share
of Traffic Systems, L.L.C.

Traffic  Systems  has now bought out the  minority  ownership  interest of Unity
Wireless.  As has been the  practice  since  October,  please  continue  to work
directly with us regarding our Sonem products and any related warranty issues.

I believe having  complete  ownership of Traffic  systems will be beneficial for
both of us.

If I can be of assistance to you in any manner, please let me know.

Thank you, for your continued support of our Sonem 2000 products.

Sincerely,

James L. Hill
President

JLH/gf

                                       12
<PAGE>

                            LIMITED LIABILITY COMPANY

                    MEMBERSHIP INTEREST REDEMPTION AGREEMENT

     THIS MEMBERSHIP  INTEREST  REDEMPTION  AGREEMENT  ("Agreement") is made and
entered into this ___ day of April,  2001, by and among UNITY  WIRELESS  SYSTEMS
CORPORATION,  a  corporation  incorporated  under the laws of  British  Columbia
("Unity") TRFFIC SYSTEMS L.L.C. and Arizona limited company ("Traffic Systems"),
and TRAFFIC SAFETY PRODUCTS, INC., an Arizona corporation ("TSP").

                                    RECITALS

     A.  Unity and TSP are the  owners  of all of the  membership  interests  in
Traffic Systems.

     B. Unity wishes to transfer one hundred  percent  (100%) of its interest to
Traffic Systems (the  "Interest"),  and Traffic Systems wishes to redeem all the
Interest on the terms and conditions set forth herein.

     NOW, THEREFORE,  in consideration of the mutual covenants contained herein,
and for other good and valuable  consideration,  the receipt and  sufficiency of
which are hereby acknowledged, the parties agree as follows:

                                   AGREEMENTS

     1. Redemption of Interest.  Unity hereby transfers to Traffic Systems,  and
Traffic Systems hereby redeems from Unity,  all of the Interest,  free and clear
of any liens, encumbrances, claims and rights of third parties.

     2. Redemption Price. In consideration for such redemption,  Traffic Systems
has agreed to assume certain  obligations  pursuant to that certain Agreement to
Redeem  Membership  Interest,  Transfer  Intellectual  Property  and Amend asset
Purchase Agreement.

     3. Representations, Warranties and Covenants of Unity. Unity owns, free and
clear of all liens,  encumbrances,  equities and claims whatsoever, the Interest
being sold pursuant to this  Agreement.  Unity has full legal right and power to
sell,  assign and transfer all of the Interest to Traffic Systems free and clear
of all  liens,  encumbrances,  claims and  rights of third  parties of  whatever
nature.

     4. Attorney Fees. The prevailing  party in any  litigation,  arbitration or
other proceeding  arising out of this Agreement shall be reimbursed by the other
party  for all costs  and  expenses  in such  proceeding,  including  reasonable
attorney fees.

     5.  Arbitration.  If any dispute  arises  between the Parties,  the Parties
agree to have an arbitrator settle the dispute,  the decision of such arbitrator
being deemed final and conclusive.  In the event of a dispute, the parties shall
attempt to agree on an arbitrator. If they are able to agree,

                                       13
<PAGE>

that arbitrator shall serve as the sole arbitrator. If the Parties are unable to
agree,  then the Parties shall each select an arbitrator,  and those arbitrators
shall select an independent  arbitrator,  which independent  arbitrator shall be
the sole arbitrator. The cost of any arbitration shall be shares equally between
the Parties.

     6. Miscellaneous

          a. Amendments. This agreement may not be amended or modified except in
writing signed by the parties.

          b. Entire Agreement.  This agreement contains the entire understanding
of the parties and supersedes any prior  understandings and agreements,  written
or oral, respecting the subjects discussed herein.

          c. Governing law. This Agreement  shall be governed by the laws of the
State of Arizona.

          d. Heirs and Assigns.  This Agreement shall be binding on and inure to
the benefit of the parties, their respective heirs, successors and assigns.

          e. Counterparts.  This Agreement may be executed in counterparts, each
of which, when executed, shall be deemed an original.

          f.  Authority.  Each party warrants that it has the authority to enter
into this Agreement and that the person  signing on its behalf,  if any, is duly
authorized to do so.

          g.  Fees  and  Expenses.  Each  party  shall  bear its own  legal  and
accounting fees, and other expenses of whatever nature.

          h. Notices.  Any and all notices  required by this Agreement  shall be
personally delivered or sent by Federal Express or other overnight mail, postage
prepaid, addressed as follows:

          To Unity:

                 Unity Wireless Systems Corporation
                 7438 Fraser Park Drive
                 Burnaby, B.C.
                 Canada V5J5B9
                 Attn: Tom Dodd

          To Traffic Systems:

                 Traffic Systems, L.L.C.
                 7441 East Butherus, Suite 300
                 Scottsdale, Arizona 85260
                 Attn: James L. Hill

                                       14

<PAGE>

          To TSP:

                 Traffic Safety Products, Inc.
                 7441 East Butherus, Suite 300
                 Scottsdale, Arizona 85260
                 Attn: James L. Hill

or at such  other  addresses  as the  parties  ma  designate  to each  other  in
accordance  with this Section.  A notice shall be deemed  effective when mailed,
or, if personally delivered, when delivered.

     DATED as of this ________ day of April, 2001.

                                UNITY WIRELESS SYSTEMS CORPORATION, a
                                Corporation incorporated under the laws of
                                British Columbia

                                By:      ____________________________________

                                Its:     ____________________________________

                                TRAFFIC SYSTEMS, LLC, an Arizona limited
                                Liability company

                                By:      ____________________________________

                                Its:     ____________________________________

                                TRAFIC SAFETY PRODUCTS, INC., an Arizona
                                corporation

                                By:      ____________________________________

                                Its:     ____________________________________

                                       15

<PAGE>

April 18, 2001

Mr. Jim Hill

Traffic Systems LLC
7441 East Butherus
Suite 300
Scottsdale, AZ     85260

RE:  CLARIFICATION OF PARAGRAPH 7

Dear Jim:

As we discussed,  this document is to confirm that  Paragraph 7 on Page 3 of the
"Agreement to Redeem Membership  Interest,  Transfer  Intellectual  Property and
Amend Asset  Purchase  Agreement"  does not apply to the original Asset Purchase
Agreement, Paragraph 1 (c).

As part of the  original  Asset  Purchase  Agreement,  Unity  promised to supply
enough  materials to build  detectors  for 100 4-way  intersections.  Since that
time,  there has been a question raised as to the number of Atlas horns required
for 100 intersections (i.e. 400 or 800 horns).

We agree to work out the  payments  for  these  horns  separately  from the main
Agreement. Please signify your agreement by signing below.

Regards,

Tom Dodd
Senior Vice-President & General Manager,
Unity Wireless Systems Corporation

         James L. Hill                      ---------------------------------

         For Traffic Sytems LLC

                                       16
<PAGE>

April 9, 2001

Mr. Jim Hill

Traffic Systems LLC
7441 East Butherus
Suite 300
Scottsdale, AZ     85260

RE:  AMENDMENT TO ASSET PURCHASE AGREEMENT

Dear Jim:

As we discussed,  this document is to amend the Asset Purchase Agreement,  dated
for reference  October 6, 2000,  between  Unity  Wireless  Systems  Corporation,
568608 BC Ltd. (since  amalgamated with Unity Wireless  Systems Corp.),  Traffic
Systems LLC, Traffic Safety Products Inc. and James Hill, as follows:

Replace the last sentence of Paragraph 4 (Royalty Payment) with:

     Such royalty shall be paid by Buyer  commencing on the fifteenth (15th) day
     of the first quarter of 2001 and continuing on the thirtieth  (30th) day of
     each  quarter  thereafter  based  upon the gross  profits  of Buyer for the
     immediately preceding quarter.

Please signify your agreement by signing and returning this document.

Regards,

Tom Dodd
Senior Vice-President & General Manager,
Unity Wireless Systems Corporation

         Traffic Systems LLC                ----------------------------------

         Traffic Safety Products Inc.       ----------------------------------

         James L. Hill                      ----------------------------------

                                       17

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