Which of the following is prohibited in airside driving behavior?

Reversing without a lookout is prohibited in airside driving behavior because it significantly increases the risk of collisions and accidents within a busy airside environment. When operating a vehicle in a crowded space such as an airport, maintaining awareness of the surroundings is crucial for ensuring the safety of both personnel and aircraft.

Reversing without a designated lookout means that the driver may not have a clear visual on potential hazards or other vehicles in their immediate area. A lookout provides an additional layer of safety, ensuring that the driver can safely maneuver their vehicle without putting themselves or others at risk.

In contrast, the other behaviors listed are commonly recognized as hazardous and contribute to unsafe conditions on the airfield. For example, passing other vehicles on the runway is typically restricted due to the potential for creating conflict between vehicles and aircraft. Accelerating quickly towards an aircraft can also pose significant dangers as it might not provide sufficient time for the aircraft crew to react. Additionally, driving without a valid permit undermines the regulatory frameworks established to ensure that only trained individuals operate vehicles in sensitive areas.