GB/T 31418-2025Terminology for road traffic signal control systems (English PDF)

3.1 Basic Terminology

3.1.1

[road] traffic signal control

To ensure safety, improve efficiency, and optimize right-of-way, traffic lights (3.1.2) are used to allocate traffic flow in terms of time.

Traffic control measures for right-of-way.

3.1.2

[road] traffic lights [road] traffic signal lights traffic lights

A signaling device that directs vehicles and pedestrians by using different combinations of red, yellow, and green light-emitting units.

Note. Red illuminated units indicate no passage, green illuminated units indicate passage is permitted, and yellow illuminated units indicate a warning.

3.1.3 Traffic signal controller

A device capable of changing the sequence of road traffic signals, adjusting timing, and controlling the operation of road traffic lights (3.1.2).

3.1.4

It consists of road traffic lights (3.1.2), road traffic signal controllers (3.1.3), traffic detectors (3.2.18), communication equipment, and control computing.

A system consisting of a computer and related software.

3.1.5

[Road] Traffic signal control mode of [road] trafficsignal signal control mode

The road traffic signal control system (3.1.4) determines road traffic signals autonomously or through manual intervention based on traffic flow patterns and control objectives.

The mode of signal light (3.1.2) status.

3.1.6 Traffic signal timing

Based on traffic flow patterns, the process of designing and optimizing signal control parameters (3.1.7) to achieve control objectives.