What should an operator do when approaching an active runway?

When approaching an active runway, the appropriate action is to stop and wait for clearance. This is critical for ensuring safety on the airfield. Active runways are among the most hazardous areas because aircraft may be taking off or landing at any moment. Stopping allows the operator to assess the situation fully and ensures that they have received the necessary clearance from the air traffic control tower before entering the runway.

Waiting for clearance is essential because it prevents unauthorized entry onto the runway, which could lead to serious accidents. Additionally, operators must remain vigilant and attentive to any communication from air traffic control, as they provide vital information about when it is safe to proceed. This practice is a fundamental aspect of maintaining safety protocols in airfield operations.

The other options do not adequately prioritize safety. Proceeding without stopping if the runway seems clear could be hazardous, as it doesn't account for an unseen approaching aircraft. Contacting the tower only if necessary may lead to miscommunications or delays that aren't conducive to safety. Continuing to drive at a slow speed does not mitigate the risk of entering an active runway without authorization and could still result in dangerous situations.