What type of communication method is appropriate for airside vehicle operators?

Radio communication for coordination with the control tower is the appropriate method for airside vehicle operators. This method facilitates immediate and effective communication between vehicle operators and air traffic control personnel, allowing for real-time updates and instructions regarding airside operations. This is crucial for maintaining safety and ensuring that all movements are coordinated, especially in the busy environment of an airport where timely responses can prevent accidents or misunderstandings.

Handheld devices while driving can be distracting and may pose safety risks, as they can take the operator's attention away from driving and the surrounding environment. Using loudspeakers, while potentially effective for broadcasting messages, does not provide the target-specific communication needed for airside operations and can lead to misunderstandings. Relying solely on gestures is insufficient for clear communication, as it does not convey detailed information necessary for safe operations in a complex airside environment.