What color should the rear hazard warning lamps be?

The correct answer is red because, according to traffic and safety regulations, rear hazard warning lamps are intended to signal other road users of a vehicle's presence and potential hazard. Red is universally recognized as a color that indicates danger or caution, making it the most appropriate choice for rear hazard warning lamps. This ensures that drivers approaching from behind can clearly see that a vehicle is in distress or if there are any safety concerns ahead.

While other colors like amber and white may be used for specific signaling purposes (such as caution or for certain types of vehicles), red specifically indicates a hazard situation, thereby serving the crucial function of alerting other drivers effectively. Green is generally not associated with hazard warning signals in the context of vehicles.