stop light         
noun [ C ] 
 一组交通灯中的红灯
a red light on a set of traffic lights or other traffic signals
  He risked a serious accident by sailing through a stop light. 他航行时冒着发生严重事故的风险闯了红灯。 
 The coach had tried to cross the railway line even though red stop lights had warned of an oncoming train.
  US同stoplight 
a  stoplight 
 - More examples
 - A couple of drivers ran a stop light.
 - His face lit up like a stop light.
 - Give pedestrians a few seconds head start at stop lights, before cars are given a green signal.