Is the traffic light at the entrance of Nanjing Maigao Bridge Fuyi International Hotel useful?

What do you mean, are the traffic lights useful? It is useful because the signal lamp is installed and works normally. If you violate it, it is illegal to run a red light. It's useless if the light doesn't work.

If there is no traffic police at the intersection, but monitoring is installed. According to the current technical level, it is certainly useful to spend so much money on monitoring. Except when there is a mistake, you can shoot the violation of running a red light.