What color are the lights on airside vehicles typically required to be?

Airside vehicles at airports are typically required to have lights that are amber or yellow. This color is universally recognized for various types of vehicles used in operational areas, as it serves a crucial purpose in visibility and safety. Amber or yellow lights are used to signify caution and alert other personnel and aircraft to the presence of vehicles on the airside.

This standardization helps ensure that all vehicles are identifiable in both daylight and low-light conditions, thereby reducing the risk of accidents. The use of these colors is common among ground handling equipment, maintenance vehicles, and other vehicles operating in close proximity to active runways and taxiways.

The other color options do not serve the same purpose or are not typically associated with safety measures for airside operations. For instance, red lights are generally used for stop signals, green lights often indicate safe movement or go signals in traffic contexts, and blue lights can signify emergency vehicles, which are not applicable to all airside vehicles. Hence, amber or yellow is the correct choice due to their specific function in ensuring safety and awareness in the airport environment.