DO what the locals do.

I was in Phoenix on the 101, heading back from a night spring training game, going about 85 on the freeway like everyone else. Suddenly...a few people around me started slowing down, but I didn't see any cops whatsoever. All of a sudden...a big red flash...camera on the side of the freeway snaps a picture of my car. Point of the story: do what the locals do. they know where all the speed traps are.