<P> Traffic congestion is a condition on transport networks that occurs as use increases, and is characterized by slower speeds, longer trip times, and increased vehicular queueing . When traffic demand is great enough that the interaction between vehicles slows the speed of the traffic stream, this results in some congestion . While congestion is a possibility for any mode of transportation, this article will focus on automobile congestion on public roads . </P> <P> As demand approaches the capacity of a road (or of the intersections along the road), extreme traffic congestion sets in . When vehicles are fully stopped for periods of time, this is colloquially known as a traffic jam or traffic snarl - up . Traffic congestion can lead to drivers becoming frustrated and engaging in road rage . </P>

Increase in traffic volume due to increase in transport vehicles is known as