The term spee trap can refer to a point where a speed limit is strictly enforced by police. It may also refer to locations where a speed camera is posted. Alternately, the term may also refer to a speed limit that is enforced by timing how long a vehicle takes to transverse a measured distance. Cities or road sections become known as speed traps where police have a reputation for writing an unusually high number of traffic tickets, especially speeding tickets. Sometimes the posted speed limits are not easily seen; in other places, the limits are set such that many vehicles are caught. In many of these uses, the term speed trap connotes speed limit enforcement for purposes of ticket revenue or traffic deterrence instead of safety.