A thought occurred to me during a tedious journey yesterday, when travelling why do we use the word jam when describing being
…caught in a traffic jam?
It is just a queue, in this case, it happens to be composed of traffic but if I was in a shop waiting in a queue of people I wouldn’t say I was in a people jam or queue jam… why not?
Best Answer
The sense of jam in traffic jam meaning traffic congestion developed out of the verb connotation of obstructing, blocking or become immovable. The expression dates back to the early 20th century.
As The Word Detective explains: