A traffic signal is a device used to control the flow of traffic on roads and highways. It consists of four components: HONK (4 letters), LIGHT (5 letters), stopsign (8 letters) and stoplight (9 letters). HONK is a sound made by a vehicle's horn to alert other drivers or pedestrians. LIGHT is a source of illumination that can be used to indicate when it is safe to proceed. Stopsign is a sign with the word 'STOP' written on it, which is used to indicate that vehicles must come to a complete halt. Stoplight is a traffic signal consisting of a set of red, yellow and green lights that indicate when it is safe to proceed.