Drivers' 180 (1-4)

I think it could be either:

Which length description are you looking for?:

1-4

u-turn

(Other definitions for u-turn that I've seen before include "180 degrees change of direction" , "Complete reverse of car on public road" , "Complete reverse movement as by car" , "Embarrassing reversal" , "An about face, complete change of mind" .)

I've seen this clue in The Sun.

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