T/BJITS 12-2021 Common Terms Used in Road Traffic Signal Control

Scope

Scope: This document specifies the common terminology in the field of road traffic signal control regarding traffic lights, road traffic signal controllers, signal control modes, basic parameters of signal control, and traffic signal control systems. This document applies to the planning, design, construction, operation, and management of traffic signal control systems. Main Technical Content: (1) Traffic Lights This standard defines 13 dedicated terms for traffic lights, including road traffic lights, motor vehicle lights, road intersection lights, omni-directional control lights, directional indicator lights, lane lights, ramp lights, railway crossing lights, non-motor vehicle lights, left-turn non-motor vehicle lights, pedestrian lights, traffic warning lights, and road traffic signal countdown displays. (2) Road Traffic Signal Controllers This standard defines 19 dedicated terms for road traffic signal controllers, including road traffic signal controllers, single-point road traffic signal controllers, networked road traffic signal controllers, intelligent road traffic signal controllers, signal cabinet, handheld terminals, main control units, backup control units, manual control units, on-site control terminals, independent yellow flashing, main power supply units, backup power supply units, emergency power supply units, lightning protection units, vehicle detectors, channels, and terminal blocks. (3) Signal Control Modes This standard defines 24 dedicated terms for signal control modes, including single-point control, single-point timing control, single-point sensing control, single-point full-sensing control, single-point semi-sensing control, single-point adaptive control, trunk control, offline trunk coordinated control, trunk coordinated control, trunk sensing coordinated control, regional coordinated control, cable-free coordinated control, manual control, phase locking control, channel locking control, direction locking control, yellow

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