What kind of lights should be used at the rear of a vehicle when waiting or parking?

When waiting or parking, a vehicle should use red lights at the rear. This is important because red lights are universally recognized as indicators of a stationary vehicle, alerting other road users that the vehicle is not in motion. The use of red lights serves to enhance safety by clearly signaling to other drivers that they should exercise caution when approaching or passing the parked vehicle.

Other colors, such as white, yellow, or blue, do not convey the same safety message. White lights are typically used for illumination in front of the vehicle, while yellow lights may indicate caution or alertness, but they are not standard for indicating a parked status. Blue lights are usually reserved for emergency vehicles and are not appropriate for regular vehicles in a parked position. Thus, the correct use of red lights at the rear of a vehicle serves as a critical safety feature on the road.