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Your Windshield May Affect Your SunPass

Windshields that block infrared light can keep your vehicle’s interior cooler, but they may also earn you a ticket or two.

If you have recently installed a SunPass transponder behind your rear-view mirror, be aware: your windshield may render it useless. Glass that’s designed to block the hot rays of the sun may also block the infrared rays that read your SunPass transponder as you drive through toll areas. If the equipment at the toll booth can’t detect your SunPass, you’ll receive a ticket in the mail.

The SunPass website lists several vehicles with windshields that may cause trouble for your transponder, including models from BMW, Cadillac, Land Rover, Pontiac and Mercedes-Benz.

But don’t worry. You don’t need a new windshield; just a few instructions. Depending on your vehicle, you may need to place the transponder in a specific spot on the glass, or you may need a transponder that mounts on your front license plate.

The three charts on the “Special Windshield Mounting Tips” page of the SunPass website should provide all the information you need.


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