What type of lights are used on the airside road and apron/taxiway?

The type of lights used on the airside road and apron/taxiway are single red lights on each side of the roadway. These lights serve an important safety function, helping to clearly delineate the edges of the taxiways and aprons for vehicles operating in critical areas. This marking is essential in maintaining safe operations by ensuring that ground vehicles can navigate the airport environment without inadvertently crossing into active runways or other restricted areas.

Single red lights are specifically designed to indicate caution and mark boundaries, making it clear to vehicle operators where they should or should not drive. This is especially important in an environment where aircraft operations are taking place and where there are often multiple vehicles in close proximity to each other. The red color is universally recognized as a warning sign, enhancing visibility and safety.

The other options represent different types of lighting that may not be applicable to marking the edges of runways and taxiways in this context. Understanding these distinctions is vital for maintaining awareness while driving airside and complying with safety regulations.