Except when an aircraft is being serviced loaded or unloaded vehicles should not?

Except when an aircraft is being serviced, loaded, or unloaded, vehicles should not be parked or operated within designated safety zones around the aircraft. This is to ensure the safety of personnel and prevent any potential damage to the aircraft or vehicles. Additionally, vehicles should maintain a safe distance to allow for the safe operation of ground handling equipment and emergency access. Compliance with these regulations is crucial for maintaining airport safety standards.