What does the solid continuous line in runway holding position markings indicate?

The solid continuous line in runway holding position markings signifies the area where aircraft or vehicles are required to hold before entering a runway. This marking is crucial for safety, as it clearly indicates the point at which a vehicle or aircraft must stop and ensure that the runway is clear and safe for their entry.

By understanding these markings, drivers and pilots can avoid potential runway incursion incidents, consequently enhancing overall airport safety. The distinction of this marking is significant in both ground and air traffic operations, ensuring that all movements are coordinated and controlled at busy airports like O’Hare.