The entire BA Expwy coming into and out of downtown Tulsa is heavily watched by police because of the 55 mph limit in that area. Marked vehicles & unmarked vehicles are patrolling there almost daily. Most unmarked vehicles are blue or white Chryslers with tinted windows. Recently I saw a white CHEVY TAHOE with lights on & someone pulled over. They are really getting sneaky in disguising the police vehicles. That being said, this is a dangerous part of downtown and caution should be used by following the speed limit anyway. The days of black & white with flashing lights are over, folks! Mind your speed, or you will have to pay heavily!