Which action is prohibited when driving on the airside?

Driving under the influence of alcohol or drugs is strictly prohibited when operating any vehicle on the airside due to the critical safety requirements of the area. The airport environment is highly regulated, with numerous safety protocols designed to protect both aircraft operations and personnel on the ground. Impaired driving can lead to serious accidents, increase the risk of collisions, and compromise the safety of everyone in the vicinity. Maintaining full cognitive ability and motor function is essential for making quick decisions and responding appropriately to unexpected situations, which are common in the dynamic environment of an airport.

The other options do not violate safety regulations in the same way. Using turn signals is an essential part of safe driving and helps to communicate intentions to others. Communicating via radio is a necessary practice for coordination and safety, particularly in busy areas where many vehicles and personnel are present. Reducing speed near aircraft is also a safe driving practice, as it allows for greater reaction time and minimizes the risk of accidents.