There are five types of traffic signals: directive light signals, vehicle light signals, pedestrian light signals, baton signals and gesture signals.

1. Directive light signals
The lights are red, yellow and green. 
When the green light is on, vehicles or pedestrians can move; When the yellow light is on, vehicles and pedestrians are signaled to stop moving, but they can go on moving if they have passed the stop lines when the light changes; When the red light is on, vehicles or pedestrians must not move.
When the green arrow signal is on, vehicles are allowed to move in the direction of the arrow; When the red arrow signal is on, vehicles cannot move in the direction of the arrow.
When the green light flashes, it signals the light will soon turn yellow; When the yellow light flashes, vehicles and pedestrians are allowed to move provided it is safe to do so.
The rules also apply to parades or people riding animals.

2. Vehicle light signals
These signals, in red and green, are used to direct vehicles.

3. Pedestrian light signals
These signals, in red and green, are used to direct pedestrians.

4. Baton signals
This is a set of signals that traffic police convey with batons to direct vehicles and pedestrians.

5. Gesture signals

This is a set of gestures traffic police use to direct vehicles and pedestrians.