traffic cop(n = noun.person) - a policeman who controls the flow of automobile traffic;
is a kind of officer, police officer, policeman
has particulars: crossing guard, pointsman

air traffic, automobile traffic, bicycle traffic, bus traffic, car traffic, commuter traffic, cop, cop a plea, cop out, drug traffic, foot traffic, motorcycle cop, narcotics traffic, pedestrian traffic, slave traffic, speed cop, traffic, traffic circle, traffic control, traffic court, traffic island, traffic jam, traffic lane, traffic light, traffic mile, traffic pattern, traffic signal, traffic with, truck traffic, vehicle traffic, vehicular traffic