渋滞
Traffic congestion happens due to high roadway demand, where the number of automobiles that try to pass through a road section exceeds the road’s capacity, causing a slowdown in traffic flow. Traffic congestion can also be a result of poor transportation infrastructure, road construction or traffic accidents. Traffic congestion negatively affects society’s productivity. Traffic congestions cost EU 1% of its GDP, whereas an Urban Mobility report revealed that the U.S. lost 160 million dollars due to delay and fuel costs in 2014.