yeah i know what your saying but usually the cops that hide or the speed cameras arent going to get the people that you think "wheres a copper when you need one" about. They will only get those speeders that fly past. If a marked police car is in view it will stop people people doing all the dodgy stuff not just stop them speeding.
on another note, i wonder how much of the percentage of speeding drivers fined are less that 15 ks over the limit? would anyone know how to find this info??