Correct answer
Three lights
Traffic lights for vehicles that usually regulate right of way at intersections are generally made up of three lights: one red, one amber and one green.
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Glossary terms in this question
Traffic light
A device regulating traffic with red, amber and green lights. It precedes vertical signs and road markings, but not officers’ directions, temporary signs or beaconing.
Right of way
Rules that decide which vehicle or road user goes first when several converge at an intersection or manoeuvre.
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