What is the purpose of the runway/runway hold position sign?

The runway/runway hold position sign serves a critical function in enhancing safety at an airport by clearly indicating the location where a taxiing aircraft must stop when it is approaching an intersection of two runways. This sign is typically positioned to alert pilots when they are at risk of entering a runway that intersects with the one they might be using or taxiing onto. By requiring pilots to hold their position, the sign helps prevent potential collisions between aircraft that may be taking off or landing on the intersecting runway.

The remaining options do not accurately represent the function of the runway/runway hold position sign. For example, signs indicating the runway number would provide information specific to that runway, while the marking of the runway threshold pertains to the beginning of the runway usable for takeoff or landing. Additionally, taxiway intersection markers identify where taxiways meet, not runway intersections. Thus, understanding the critical role of the runway/runway hold position sign can significantly contribute to situational awareness and safety for pilots operating within an airport environment.