Which kind of vehicles are typically allowed on the airside?

The appropriate vehicles allowed on the airside are those that are authorized, marked, and have successfully passed safety inspections. This is important to ensure safety and security in an environment that is often busy and fraught with potential hazards. Vehicles operating airside must meet specific requirements to minimize risks to both personnel and aircraft. Authorized vehicles are often identified by markings, which helps in maintaining order and ensuring that all vehicles operating in this sensitive area are easily recognizable by staff and security personnel. This protocol is crucial for maintaining compliance with aviation regulations and standards, ultimately contributing to the safe operation of airside activities.

The other options either lack the proper authorization, do not have the necessary safety checks, or are not sufficient alone to ensure safety and compliance in a bustling airside environment.