Where are two blue lights used in taxiway intersection lighting located?

• A. At the runway threshold.
• B. Along the apron boundary.
• C. At the taxiway intersection.
• D. On the airfield perimeter.

Answer: (C)

Blue lights mark the edges of taxiways. When a taxiway meets another taxiway, two blue edge lights are placed at the intersection to define the boundary of the taxiway through the crossing. This helps you identify the exact point where the taxiway continues or turns, so you stay on the correct path and avoid misidentifying the crossing.

The other locations aren’t where taxiway edge lighting is placed. Runway threshold areas use different lighting, and apron boundary or airfield perimeter areas are marked with other lighting systems that aren’t the blue taxiway edge lights used at intersections.