The theory of operation is straightforward, the software tracks moving objects along the road in the camera ... speed. The area of the image containing the road is defined by a bounding box ...

There are more than 7,000 speed cameras on our road network - catching millions of motorists every year using a variety of traps.

It's simple: drive at least 11 miles over the speed limit in San Francisco and receive a ticket in the mail for $50 or more. The faster you're caught driving, the more you would have to pay. "Like at ...