Lets say you own a white Toyota Corrolla...

Someone notes down your plate details, copies the plate, and sells it to someone who also owns a white Toyota Corrolla...

They speed through roads you have never travelled on and, hey presto, the camera photos a car with your plate number that matches their records of the car it should be on, in this instance a white Toyota Corrolla.

Outcome - YOU get a speeding ticket in an area you have never frequented..

Simples..