What is the main function of edge lights on taxiways?

The main function of edge lights on taxiways is to provide visual guidance along the edge of the taxiway. These lights assist pilots and vehicle operators in identifying the boundaries of the taxiway, especially during low visibility conditions such as fog or night operations. This visual reference is crucial for safe navigation on the airfield, helping to prevent vehicles and aircraft from straying off the designated pathways.

Edge lights typically emit a steady white light and are strategically placed to mark the full length of the taxiway edges, enhancing situational awareness for those operating in the vicinity. This aspect of airside safety is vital as it contributes to the overall efficiency and risk management of aircraft movements on the ground. Other options, while related to airfield operations, do not directly pertain to the specific function of edge lights on taxiways.