When can a driver operate a vehicle in the movement area?

Answer: B — Only after receiving explicit clearance from air traffic control

A driver is permitted to operate a vehicle in the movement area only after receiving explicit clearance from air traffic control. This requirement is in place to ensure safety and coordination within the airfield environment, as the movement area includes runways and taxiways where aircraft operate. Air traffic controllers monitor and manage all ground and air traffic, so their authorization is crucial to prevent potential conflicts between vehicles and aircraft, especially during takeoff, landing, and taxi operations. The other choices may suggest scenarios that are not in alignment with standard airfield operational procedures. For instance, relying on permission from ground crew would not adequately ensure that the vehicle's movement won't interfere with aircraft operations, as ground crew may not have real-time awareness of air traffic. Simply waiting for a runway to be clear or operating during daylight hours does not take into account the dynamic and constantly changing nature of airfield operations where safety is paramount. Clearance from air traffic control is the definitive requirement for ensuring that the vehicle can navigate safely within the movement area.