How many types of traffic light cameras are there?

[OJoshua]

There are 5 types of traffic light cameras. Here is relevant information about traffic lights: 1. Introduction: Traffic lights are signal lights that direct traffic operation. 2. Classification: Traffic lights are divided into motor vehicle signal lights, non-motor vehicle signal lights, pedestrian crossing signal lights, direction indicator lights (arrow signal lights), lane signal lights, flashing warning signal lights, and railway crossing signal lights. 3. Light colors: Initially, there were only red and green colors. After improvements, a yellow light was added. The red light means stop, the yellow light means prepare, and the green light means go. The reason for using these three colors as traffic signals is related to people's visual structure and psychological reactions.