The foil is reflecting a flash on either side onto the license plate using a flash sensor which acts as the trigger. As you can see, the noPhoto uses a flash of its own to overexpose traffic camera images. This traffic camera countermeasure puts it to an end. If you get caught in the middle when the light goes red they take a picture and you get a ticket in the mail.
These are devices that monitor intersections. But even a careful driver can get caught by bad traffic and a red light camera. Don’t get us wrong, we drive very carefully as it’s the most dangerous thing we do on a regular basis.
