Traffic congestion is a condition in transport that is characterised by slower speeds, longer trip times, and increased vehicular queueing. ... When vehicles are fully stopped for periods of time, this is known as a traffic jam or (informally) a traffic snarl-up.

What do you mean by traffic jams?

: a situation in which a long line of vehicles on a road have stopped moving or are moving very slowly stuck in a traffic jam.

How do you use traffic jam in a sentence?

(1) They detoured around the traffic jam by heading south. (2) Sorry we're late. We got stuck in a traffic jam. (3) Our coach was caught in a traffic jam and got to Heathrow forty minutes late.