What color lights denote the edge of a taxiway?

The color blue is used to denote the edges of taxiways at airports, including O'Hare Airport. This color coding is part of standardized aviation procedures, ensuring that pilots and ground personnel can easily identify the boundaries of taxiways from the air and on the ground. By using blue lights, it enhances visibility and safety, allowing for efficient navigation in potentially complex airport environments.

Each color in airport lighting serves a specific purpose, and knowing these distinctions is crucial for drivers, pilots, and airport personnel to maintain safety and operational efficiency.