Drivers shouldn't run them (4)

I believe the answer is:

reds

(Other definitions for reds that I've seen before include "These are not right" , "Tidies up" , "Scarlet and crimson, say" , "Scarlet communists" , "Colours for communists" .)

I've seen this clue in the Universal.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.