- one of a set of coloured lights placed at crossroads, junctions, etc, to control the flow of traffic. A red light indicates that traffic must stop and a green light that it may go: usually an amber warning light is added between the red and the green
WordReference Random House Learner's Dictionary of American English © 2026
ˈtraf•fic ˌlight, n. [countable]
WordReference Random House Unabridged Dictionary of American English © 2026- Transporta set of signal lights used to direct traffic at intersections.
traf′fic light′,
- a set of electrically operated signal lights used to direct or control traffic at intersections. Also called stoplight, traf′fic sig′nal, traf′fic control′ sig′nal.
- 1925–30
Collins Concise English Dictionary © HarperCollins Publishers::
traffic light, traffic signal n
'traffic light' also found in these entries (note: many are not synonyms or translations):
amber
- green light
- jump
- light
- pelican crossing
- cross
- jack rabbit
- jaywalk
- run
- yellow light
- stoplight
- straight