Crossword Genius

Unable to move in the dodgems? (6-2-6)

Ross

I believe the answer is:

bumper-to-bumper

'unable to move' is the definition.
(cars can be bumper-to-bumper in a traffic jam)

I can't explain the remainder of the clue.

(Another definition for bumper-to-bumper that I've seen is " (Of traffic) very close together".)

I've seen this clue in The Guardian.
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