Did cars or traffic lights come first in the world?

[Castillo]

In the world, cars came before traffic lights. Here is a detailed introduction to motor vehicle traffic signals: 1. Green light: Vehicles are allowed to proceed, but turning vehicles must not obstruct the passage of straight-moving vehicles or pedestrians. 2. Yellow light: Vehicles that have already crossed the stop line may continue to proceed. 3. Red light: Vehicles are prohibited from proceeding. 4. Intersections without non-motor vehicle signals: At intersections without non-motor vehicle signals or pedestrian crossing signals, non-motor vehicles and pedestrians should follow the motor vehicle traffic signals. When the red light is on, right-turning vehicles may proceed if they do not obstruct the passage of other vehicles or pedestrians.