What distinguishes controlled taxiways from uncontrolled taxiways?

Controlled taxiways are characterized by the requirement for clearance from air traffic control before a vehicle can enter or taxi on them. This regulation is in place to ensure the safety and efficient movement of aircraft and vehicles on the airside of an airport. Controlled taxiways are typically located in areas with a higher volume of air traffic or near runways where the potential for conflict with aircraft is greater.

Vehicles entering these areas must communicate with air traffic control, which provides instructions to prevent accidents and maintain orderly operations. This is crucial in reducing the risk of collisions between aircraft and vehicles, as well as improving overall air traffic management.

In contrast, uncontrolled taxiways do not require such clearance, allowing for more flexibility in movement, but also requiring operators to be more vigilant and aware of their surroundings. Therefore, the requirement of clearance from air traffic control clearly identifies controlled taxiways and highlights their role in maintaining safety and coordination within the air traffic system.