> The frame rates and resolutions of most cameras aren't great for precisely estimating speed.
How good do you think the numbers would be? For example, the speed limit on my road is 25 mph but I know people routinely drive through at 40 mph. Would a camera system be good enough to record, say, 30 mph with error bars equal to +/- 5 mph?
If you can set up clear distance markers 100m apart on the road itself, a regular surveillance camera set up with its line-of-sight perpendicular to the road could probably estimate speeds between 5 and 80 mph with at least 1 mph precision, and adding some image processing software could probably give you 0.1 mph precision or better.
Oblique views, curved roads, unclear markers, or even differently colored cars could produce false results, or no results at all.
It may be enough to convince your local cop shop to set up a radar trailer on your street for a few days, but you're not going to be convicting anyone of reckless driving with it.
How good do you think the numbers would be? For example, the speed limit on my road is 25 mph but I know people routinely drive through at 40 mph. Would a camera system be good enough to record, say, 30 mph with error bars equal to +/- 5 mph?