Many unmarked cars now that are hard to spot their two white bars each side of their middle stop light, some with Dodge Challengers and other large vehicles but all with personal tags. They will speed in and out of traffic with the flow usually doing up to 9 miles over the limit and pull one per one way trip over a course of the entire patrol. They try for a minimum of one per each direction. I have seen them stop large vehicles for speeding over 10 mph but let the small new cars get by with above 14 mph. I don’t know why.