Which vehicle operations are allowed on taxiways?

The correct answer reflects the strict protocols governing vehicle operations on taxiways to ensure safety and order within the airfield environment. Taxiways are critical areas of an airfield designed for aircraft to maneuver between runways and terminals. For this reason, only authorized vehicles, typically those operated by trained personnel, are allowed on these designated paths.

This ensures that vehicle traffic does not interfere with aircraft operations and reduces the risk of accidents or incidents. Individuals operating vehicles on taxiways must adhere to specific instructions from air traffic control towers. These directives ensure that vehicle movements are coordinated with air traffic to maintain a safe operational environment.

The other options propose scenarios that do not align with established safety protocols. Unrestricted operations for any vehicle would compromise airfield safety, allowing uncontrolled access that could lead to dangerous situations. Only allowing non-military vehicles does not account for the necessary involvement of military vehicles that are often integral to airfield operations, nor does it recognize the importance of maintaining strict operational control. Lastly, permitting personal vehicles of airfield personnel is impractical as it could lead to a breach of security and safety oversight. The regulations are in place specifically to minimize risks associated with the high-stakes environment of air operations.