Comment by telot1

10 year veteran of the ITS industry here. It's not trivial to do camera speed recognition. You need to do ranging in addition to the video detection to know how far the vehicle is from the camera to accurately measure the speeds using movement between frames. These systems cost in the $10,000+ range, while a k-band doppler can be had for around $500. It's a no brainer to stick with the 1940's doppler technology ;)