What must drivers do when approaching an active runway?

Answer: B — Stop and wait for clearance

When approaching an active runway, drivers must stop and wait for clearance before proceeding. This is crucial for ensuring safety in areas where aircraft are landing or taking off, as they can be moving at high speeds and can come unexpectedly. Stopping allows the driver to properly assess the situation, listen for any communication from air traffic control, and ensure that it is safe to cross. This procedure helps prevent accidents and ensures that the operations on the airfield can continue without interruption. It’s important to understand that speeding up to cross quickly could endanger both the driver and any aircraft in the vicinity. Proceeding without stopping, even if it appears clear, ignores the potential for hidden risks, such as aircraft that may be out of sight until they are very close. Lastly, only looking for incoming aircraft does not account for the necessary communication with air traffic control and the full situational awareness required in an active airfield environment; simply watching for planes does not grant permission to cross the runway. Thus, waiting for clearance is the safest and most responsible action.