EXHIBIT 5.1

                                January 31, 2002


I.D. Systems, Inc.
One University Plaza
Hackensack, New Jersey, 07601

Gentlemen:

          We have acted as counsel to I.D. Systems, Inc., a Delaware corporation
(the  "Company"),  in  connection  with the Company's  filing of a  Registration
Statement on Form S-3 (the  "Registration  Statement")  with the  Securities and
Exchange  Commission  under the Securities Act of 1933, as amended,  relating to
the resale of an aggregate of 821,250  shares (the  "Initial  Shares") of Common
Stock,  par value $.01 per share,  of the Company (the  "Common  Stock") and the
resale of 82,125  shares (the  "Warrant  Shares")  issuable  upon  exercise of a
warrant, dated January 22, 2002, issued by the Company to Sanders Morris Harris,
Inc. (the "Warrant").

          In  connection  with the  foregoing,  we have  examined  originals  or
copies,   satisfactory  to  us,  of  the:  (i)   subscription   agreements  (the
"Subscription  Agreements")  relating  to  the  purchase  of  the  Shares,  (ii)
Company's Certificate of Incorporation, as amended, (iii) Company's By-laws, and
(iv) resolutions of the Company's board of directors  authorizing the Company to
enter into, and consummate,  the  transactions  contemplated by the Subscription
Agreements,  including  the issuance of the Warrant.  We have also reviewed such
other matters of law as we have deemed relevant and necessary as a basis for the
opinion  hereinafter  expressed.  In  such  examination,  we  have  assumed  the
genuineness of all signatures, the authenticity of all documents submitted to us
as originals  and the  conformity  with the original  documents of all documents
submitted  to us as  copies or  facsimiles.  As to any  facts  material  to such
opinion,  we have,  to the extent  that  relevant  facts were not  independently
established by us, relied on certificates of public  officials and  certificates
of officers or other representatives of the Company.

          Based upon and subject to the  foregoing,  we are of the opinion  that
(a) the  Initial  Shares  have  been  validly  issued  and are  fully  paid  and
non-assessable  and (b)  the  Warrant  Shares,  upon  issuance  and  payment  in
accordance with the terms of the Warrant, will be validly issued, fully paid and
non-assessable.

          We hereby  consent to the filing of this  opinion as an exhibit to the
Registration  Statement and to the reference made to us under the caption "Legal
Matters" in the prospectus  constituting part of the Registration  Statement. In
giving this consent,  we do not thereby admit that we are within the category of
persons  whose  consent is required  under  Section 7 of the Act,  the rules and
regulations of the Securities and Exchange Commission promulgated thereunder, or
Item 509 of Regulation S-B promulgated under the Act.


                                       Very truly yours,


                                       /s/ JENKENS & GILCHRIST PARKER CHAPIN LLP
                                       -----------------------------------------
                                       JENKENS & GILCHRIST PARKER CHAPIN LLP