Which agency's instructions must be followed by vehicle operators on a runway?

The instructions provided by the Control Tower must be followed by vehicle operators on a runway because the Control Tower is responsible for air traffic management and ensuring safe operations on runways. They coordinate the movements of aircraft and vehicles on the airfield, providing vital information and authorizations. This includes managing the flow of air traffic and maintaining operational safety, making their guidance critical for anyone operating a vehicle in the vicinity of an active runway.

While other agencies such as Ground Control and Emergency Services play essential roles in airport operations, the Control Tower specifically has the authority to govern runway access and the sequence of movements for both aircraft and vehicles. Security Patrols may have an oversight function related to safety and security, but they are not primarily responsible for directing runway traffic. Therefore, adhering to the Control Tower's instructions is essential for safe and compliant vehicle operation on the runway.