All the new stuff is IP based, no film required.
Speed cameras are big business down here. Australians contribute a significant ammount of money to the government coffers via "Speed Tax"
One of the projects I'm working on is developing the Police traffic monitoring systems for India. Most of the IP traffic is one way (from the camera to the police HQ) but they are looking at ways of better utilising the down stream traffic. One of the ideas is screens at intersections with traffic info displayed on them along with advertising to watch while you wait for the lights to change
There's more than one way to make a buck out of them.
Cheers