I'm a motorway engineer looking after signals, signs, traffic lights etc on the M4 and M5.
One time we had to do a two day course on speed cameras down in South London, (i don't work on them i might add, it was some HA multi skills objective) not much fun i can tell you.
On the site visit at a camera nearby the depot, people were throwing drink cans at us and shouting abuse.
Anyhoo, back at the depot they have a huge cork notice board and its just full of pictures of arses... literally. They process thousands of pictures and there are quite a suprising amount of bum pics
Most of them were people in the back of vans with their doors open (no plate visible). One picture had 5 guys showing butt cheecks in the back of a transit. Most entertaining.