1. A visual signal to control the flow of traffic at intersections
   "The driver stopped when the stoplight turned red";
   - traffic light, traffic signal, robot [S.Africa]
    
2. A red light on the rear of a motor vehicle that signals when the brakes are applied to slow or stop
   "The driver behind noticed the sudden illumination of the stoplights";
   - brake light

Derived forms: stoplights

Type of: light, visual signal

Part of: brake system, brakes

Encyclopedia: Stoplight