For the road traffic science, see various articles under Road traffic management.

Road traffic control involves directing vehicular and pedestrian traffic around a construction zone, accident or other road disruption, thus ensuring the safety of emergency response teams, construction worker

Construction worker

A construction worker or builder is a professional, tradesman, or labourer who directly participates in the physical construction of infrastructure.-Construction trades:...

s and the general public.

Traffic control also includes the use of CCTV

Closed-circuit television

Closed-circuit television is the use of video cameras to transmit a signal to a specific place, on a limited set of monitors....

 and other means of monitoring traffic by local or State roadways authorities to manage traffic flows and providing advice concerning traffic congestion

Traffic congestion

Traffic congestion is a condition on road networks that occurs as use increases, and is characterized by slower speeds, longer trip times, and increased vehicular queueing. The most common example is the physical use of roads by vehicles. When traffic demand is great enough that the interaction...

.