I should have added a down side to the "savings" of not hiring the cop over the cost of cameras: When a cop stops the vehicle, he can often write or arrest for other things; a camera can't.
The cameras don't differentiate between a simple lack of attention, and a drunk; both are equally mailed a simple red light ticket.
The camera won't see the drugs or other contraband on the seat or floorboards.
The camera will ID the driver, but not the wanted perp in the back seat. For that matter, the citation may be mailed, but the driver with warrents out on him won't be hauled in by the camera.
I dont know where you live, but cops are making over $100k a year with all their benefits here