"During the green light, which lasts about 90 seconds, about 40 vehicles can pass the crossroad with an assistant keeping the order, " says Zhou Zhentong, leader of Zhongguancun traffic police team.
虽然他们的工作看似简单,但是他们为维护首都的交通秩序做出了很大的贡献。 在绿灯亮的90秒内,有交通协管员的时候,40辆车可以通过十字路口,没有交通协管员的时候只能通过15辆。
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