Double-yellow-line Definition

noun

(UK) A pair of yellow lines painted at the side of a road to show that parking is not permitted at any time.

1995 Nina Fletcher, Janet Holt, "Ethics, law, and nursing"
1998 Ruth Gairns, Stuart Redman, "True to life: English for adult learners.
I'm sorry, you were parking on a double yellow line, you've got a ticket.
1999 Ruth Rendell, "A site for sore eyes"
2001 Julian Symons, "A Three-Pipe Problem"
When he reached the street Claber and the girl were crossing the road to a Mercedes coupé, parked on a double yellow line.
Wiktionary

A pair of yellow lines painted along the middle of a road to show that traffic should not cross into the oncoming lane.

1987 Popular Science (May)
1998 Jack C. Richards, Jonathan Hull, Susan Proctor, "New interchange: English for international communication"
Police officer: Well, for one thing, you went over a double yellow line back there to pass a car.
2000 Bob Bondurant, Edwin J. Sanow, "Bob Bondurant on police and pursuit driving"
Wiktionary