This is a two part trap, not only are they monitoring speed during mid-day hours, they have cameras set up to photo license plates and record the plate with the speed. The police watch for regular vehicles and run the plates at random. If there is anything on your record they pull you over.

My wife was pulled over, had a suspended license and they knew this all along. They had a photo of her plates ran them days ago and waited until she went through the intersection.