As you drive past Sutton Rd exit83 south bound on I-77 the police will hide on the bridge and clock your speed with radar as you pass under the bridge. You can not see them till you look in your mirror back up on the bridge. As they check your speed there will be 2 or more police cars hiding on the entrance ramp waiting on the signal from the police on the bridge to pull you over. I drive to Rock Hill from Charlotte every day and they do this several times a week.