As you are going from Phoenix to Flagstaff, Arizona Highway Patrol runs a speed trap as you are coming off the mountain and going into Camp Verde. You usually only see the patrol cars in freeway exit on ramps waiting for suspected speeders as you enter Camp Verde. Now thay usually have one patrol car running radar in the diesel emergency pullout area which is hidden as you speed down the mountain into Camp Verde. Usually this officer clocks the speeders and radios ahead to other waiting officers sitting on the freeway on ramps.