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It is totally legal to make your numberplate invisible to Speed Cameras

When a speed camera takes a picture of your number plate, you are not allowed to tamper with the plate to make it illegible. There is however, nothing in the legislation to stop you from making your plate reflective. You can quite legally make it reflect the light from the Speed Camera Flash to give a light so bright that it obscures the number plate and leaves you free to drive on.

After extensive research, we found that the best product to do this was Photoblocker.
It is made in America to the highest possible standard. You just spray it very thinly on your number plate and although the spray is invisible to the naked eye, it bounces back a flash from a camera. The Flash used in Speed Cameras is very bright so the reflection is very bright too making your number plate invisible.

Please note that we do not condone speeding so please drive within the law