What must drivers do prior to entering or crossing a runway?

Before entering or crossing a runway, drivers are required to contact the control tower via two-way radio for permission. This step is essential for maintaining safety and ensuring proper coordination between ground vehicles and air traffic. The control tower holds an overarching responsibility for managing all air traffic, both in the airspace surrounding the airport and on the ground, including runways and taxiways.

By obtaining permission, drivers receive critical information regarding current runway usage, potential aircraft movements, and any ongoing operations that could affect their safety while on or near the runway. This practice minimizes the risk of incidents, such as collisions with aircraft, by ensuring that both air traffic and vehicular traffic are adequately synchronized.

The other choices do not adhere to established safety protocols. For instance, proceeding without stopping disregards critical safety measures, while waiting for another vehicle to cross does not account for the possible presence of aircraft that may need the runway clear. Observing the runway before proceeding, while prudent, is insufficient if the driver has not communicated with the control tower for clearance. Effective communication with air traffic control is a necessary layer of safety in airport operations.