From Longman Dictionary of Contemporary Englishtraffic lightsˈtraffic ˌlights ●●● S3 noun [plural] 
TTRa set of red, yellow, and green lights that control traffic
TTRa set of red, yellow, and green lights that control trafficExamples from the Corpus
traffic lights• The woman was killed while she was out walking with her husband, when two cars collided at traffic lights.• Cars have been stolen at traffic lights.• Access at the bottom of Tubwell Row to the ring road might have to be controlled by traffic lights.• No traffic lights then - these men used to give him right of way.• She slowed down at the traffic lights by Sloane Street.• As I wait at the traffic lights I find myself crying.• A pelican crossing system will be installed between the traffic lights at Blackfriars Road and the box junction at Rennie Street.• Where would we be without traffic lights? 