Is there a camera at the traffic light in Gaomi Wiki?

Nowadays, traffic lights need to be monitored, and the number of monitoring is calculated according to the traffic flow. The greater the traffic flow, the stricter the monitoring requirements, and there is nothing that is not qualified. First, three principles of traffic lights at intersections; Concentrate, observe carefully and prevent in advance. Second, the principle of "three first": 1, turning vehicles let the straight vehicles go first. 2. Go the right way first. Turn right and let the left turn go first.