Have them take pictures of every car, now you've got half of what flock offers.

It's the widespread remote camera installs that are the main problem there. If they kept data locally and had to be collected by hand, it might be fine - that's difficult enough to grow to monitor everyone all the time. Aside from using film though, I'm not sure how that would be achieved.

(To be clear, I really do think we should be prosecuting speeding (and tailgating) MUCH more than we do. Far more death and damage occurs from it than we should allow. But ubiquitous networked cameras are not the way we should do that.)