Originally Posted by NRGSwing

In California, it's not legal for the CHP to use radar unless it's posted. They can use a plane (where posted) or "pace". White cars are more visible/easier for the eye to pick up than darker colors so more attention getting to law enforcement. It used to be that Red was #1 with White at #2, but that was a number of years ago (from traffic school). With more bright colors coming out over the last 10 years or so that may have changed.