What is the function of the “hold short” line?

The "hold short" line serves a critical role in airfield operations by marking the precise location where vehicles must stop before entering a runway or taxiway. This line is essential for maintaining safety, as it helps distinguish between areas where aircraft may be taxiing, taking off, or landing and those where vehicles can operate without conflict.

By requiring vehicles to stop at this designated line, it minimizes the risk of accidents and ensures that air traffic controllers can manage both aircraft and vehicle movements effectively. Understanding the purpose of this line is crucial for anyone driving on the airfield, as it directly contributes to the safe coexistence of ground vehicles and aircraft in busy operational environments.

The other options do not reflect the primary safety function of the "hold short" line, as it is not intended for parking, turning around, or indicating the end of the airfield. Instead, its exclusive purpose is to control vehicle access to active runway and taxiway areas.