What color are the most common taxiway edge lights?

The most common taxiway edge lights are blue. These lights are essential for guiding pilots during taxiing and help to clearly define the edges of taxiways, ensuring that aircraft stay on the designated paths while moving on the ground. The blue color is universally used for taxiway edge lighting at airports around the world, making it distinct from the other colors used for different purposes.

Green lights are typically used for runway edge lights, guiding pilots on approach and takeoff, while white lights are used for runway centerlines and perimeter markers. Yellow lights are often used for marking caution areas and taxiway intersections or for indicating work zones. Hence, blue stands out as the correct answer for taxiway edge lights specifically.