Freeway feature (4)
I believe the answer is:
ramp
'freeway feature' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for ramp that I've seen before include "Slope - racket" , "Level-connecting slope" , "Sloping surface; swindle" , "Wheelchair access?" , "It gets travellers off" .)