Exhibit 99.1

AMENDMENT X

TO OFFICE LEASE AGREEMENT BY AND BETWEEN



Spruce Tree Centre L.L.P.

and

Image Sensing Systems

---



This Lease Amendment X, made and entered into this12thday of May, 2009 by and
betweenSpruce Tree Centre L.L.P.(Lessor), andImage Sensing Systems(Tenant), hereby amends the Office Lease Agreement
(Lease) datedNovember 24, 1998 ,Lease Amendment I datedOctober 9, 2001and Lease Amendment II datedMay
24, 2002,Lease Amendment III datedApril 22, 2004,Lease Amendment IV datedAugust 19,2005, Lease Amendment
V dated February 1, 2006, Lease Amendment VI dated July 21, 2006 and Lease
Amendment VII dated April, 2007 and Lease Amendment VIII dated April 2008 and
Lease Amendment IX dated October 7, 2008 with Spruce Tree Centre L.L.P.; between
Lessor and Tenant for Premises at Spruce Tree Centre, 1600 University Avenue,
St. Paul, Minnesota as follows:



Now, therefore, it is agreed that:



1.

        Paragraph (1) of Amendment IX is amended to provide that the premises
shall be reconfigured according to the attached space plans. On Fourth floor the
space shall include Suites 418 and 420 consisting of Suite 418 with 562 rentable
sq. ft and Suite 420 with 4,287 rentable square feet for a total of 4,849
rentable sq. ft. Suite 500 shall be increased with the addition of Suites
505/507 consisting of 2815 rentable square feet. Fifth floor space shall now
consist of: Suite 500 @ 3,456 rentable sq. ft. plus Suites 505/507 @ 2,815
rentable sq. ft. plus Suite 508 North @ 1,107 rentable sq. ft. plus Suite 508
South @ 983 rentable sq. ft. plus Suite 510 @ 1,985 rentable sq. ft. for a total
fifth floor space consisting of 10,346 rentable sq.ft. Therefore total square
footage on 4thand 5thfloors is: 4,849 + 10,346 = 15,195
rentable sq. ft. Suite 420 shall include the exterior patio deck consisting of a
30 ft. by 25 ft. patio on the roof of 3rdfloor and immediately
adjacent to the west end of Suite 420 as shown on the attached space
plan.




2.

        In addition, the following plan is acknowledged. On September 30, 2009, Spruce Tree Centre shall make available for tenant improvements, Suites 505 and 507 currently leased to Cornerstone Therapy for Image Sensing Systems 5thfloor expansion. Upon completion of tenant improvements in Suites 505 and 507, Image Sensing Systems shall have the option to terminate the obligation to continue to lease Suites 407, 409, 414 and 416
after its occupancy of Suites 505 and 507.




3.

        Paragraph (1) of Amendment VIII is amended to provide that the starting date for Suites 505 and 507 shall be October 31, 2009 and the expiration date of the Amended lease shall be extended three (3) years to May 31, 2013.




---

4.

        The Base Rental Rate as outlined in Paragraph 3a is amended as follows:




Year

        MonthlyRent#500&420

        MonthlyRent#508

        MonthlyRent#407 & 409

        MonthlyRent#414 & #416

        MonthlyRent#418

        MonthlyRent#510

        TotalMonthlyRent06/01/09 - 11/30/09

        $5,339.60

        $1,463.00

        $697.20

        $966.00

        $326.20

        $1,389.50

        $10,181.00




Suites 500, 505/7, 508 and 510Monthly Rent

        Suites 418&420Monthly

        TotalMonthly Rent11/30/09 - 5/31/10

        $7,228.50

        $3,271.50

        $10,500.0006/01/10 - 5/31/11

        $7,228.50

        $3,271.50

        $10,500.0006/01/11 - 5/31/12

        $7,228.50

        $3,271.50

        $10,500.0006/01/12 - 5/31/13

        $7,228.50

        $3,271.50

        $10,500.00




5.

        Lessor will provide $135,500 for Leasehold Improvements for Suites 500, 505, 507, 508 and 420 as specified in the attached estimate from Park Edge Construction.




6.

        Parking. By this Amendment IX parking spaces in the attached ramp included in Base rent shall increase from 22 parking spaces to 25 parking spaces.




7.

        To the extent not specifically amended or modified herein, all terms and
conditions of the original lease, addenda and amendments shall remain in full
force and effect. However, for any clause  in any manner modified, amended or contradicted, this Lease
Amendment shall take precedence over the original documents.






SPRUCE TREE CENTRE LLP

        

        IMAGE SENSING SYSTEMSBY:

        

        

        BY:ITS:

        Agent

        

        ITS:

        CFO








---