stoplight

noun

Etymology: From stop + light.

1. A traffic control signal, traditionally consisting of three lights, colored green, yellow/amber, and red, meaning proceed, prepare to stop, and stop, respectively.
2. A light on the rear of a vehicle that is activated when braking; a brake light.

   “The rear lamps are combined with the service stoplights and are contained in stoplight part and blackout marker light assemblies at the rear of the vehicle.”