In a traffic jam when drivers can't get where they are going on time or at the expected speed of travel this is referred to as .?

In a traffic jam, when drivers can't reach their destination on time or at the expected speed, this is referred to as "congestion." Traffic congestion occurs when the demand for road space exceeds its capacity, leading to slower speeds, longer travel times, and increased vehicle queue lengths. It can result from various factors, including accidents, road work, or simply high volumes of traffic.