fixed-time traffic lights
Traffic signals that operate on a preset schedule rather than responding to real-time traffic conditions.
This intersection has fixed-time traffic lights, so they change at set intervals even late at night.
感応信号 are traffic lights that detect vehicles or pedestrians and change accordingly, while 時差信号 operate on a fixed timer.
Compound of 時差 (time difference) and 信号 (signal, traffic light), referring to signals that change at fixed time intervals.