What is the primary purpose of runway guard lights and hold-short markings at runway intersections?

• A. To warn and prevent incursions by pilots or vehicles inadvertently entering a runway area.
• B. To improve runway lighting during sunrise.
• C. To mark taxicab routes for maintenance crews.
• D. To indicate weather conditions on the field.

Answer: (A)

The main idea is safety at runway intersections: these features are there to prevent runway incursions by giving a clear, early warning and a firm boundary before entering an active runway. Hold-short markings create a physical stop line. The solid lines on the runway side and the dashed lines on the taxiway side indicate where you must stop and that crossing requires explicit clearance. Runway guard lights reinforce that boundary by flashing two red lights to alert pilots and ground vehicles that a runway is nearby and entry isn’t allowed without clearance. This combination helps prevent slips where someone accidentally enters the runway, which is crucial for avoiding conflicts with already operating aircraft, especially in poor visibility or busy conditions. They aren’t meant to improve lighting at sunrise, mark maintenance routes, or convey weather information.