Trap Tap is a very clever device that will let you know when you’re coming up on a speed trap and is legal in all 50 states. How, you ask? Simple, instead of detecting the radar, which is illegal in some states. Trap Tap has mapped all of the known speed traps in 60 different countries, which is almost too incredible to believe, so I assume that info is available somewhere. From there, they will rely on their network of users to double tap the device that sits on your dash to let it know if there is an unmarked speed trap or the trap is gone. Ideally, enough people would have it so you always get really accurate info. It’s not fool proof, but for $82, it could certainly pay you back in speeding tickets not had from traps it does know about.