Which of the following is a necessary practice when driving on a taxiway?

When driving on a taxiway, giving way to approaching aircraft is a crucial practice for ensuring safety and operational efficiency on the airfield. Taxiways are the pathways designed for aircraft to move between runways and other parts of the airport. Since aircraft require significant space and time to maneuver, those driving on the taxiways must always be vigilant and yield to their right-of-way.

This practice helps in preventing collisions and maintaining the flow of air traffic. Aircraft move at much larger scales compared to vehicles, and their maneuverability can vary. As a vehicle operator on the taxiway, it's essential to be aware of any aircraft and to give them the right of way to avoid any accidents. This principle is foundational in airfield driving protocols and is taught extensively to ensure safety.

Other practices, such as stopping for all ground vehicles or driving at high speeds, can lead to operational issues and present safety hazards. Similarly, yielding only to helicopters would not encompass all types of aircraft that might be using the taxiway. Adhering to the rule of yielding to approaching aircraft addresses the broader safety and coordination requirements necessary for effective airfield operations.