Student or Learner
Could you please tell me a difference between meanings of the following words:
- traffic jam
In what case is better to use each of them?
Congestion is a noun used generally for any sort of blockage: people in a crowd, a blocked up nose when you have a cold - all are forms of congestion.
A traffic jam (jam = squashed together) applies only to motor vehicles that have come to a standstill for some reason: an accident, a narrow road etc.
Oddly, people in the UK do sometimes use traffic jam to describe any sort of blockage or standstill, usually meaning pedestrian traffic, but sometimes meaning a lot of jobs waiting to be done by someone...