In the event of an emergency, what should be done with alert vehicles?

Using a walking guide with a luminescent wand if visibility is low is essential during an emergency for several reasons. First, a walking guide helps maintain safety by providing a clear path for alert vehicles, particularly in conditions where visibility is compromised. This is crucial because emergencies can lead to chaotic situations on the airfield, making it difficult for drivers to navigate without guidance.

Additionally, a luminescent wand enhances visibility for both the guide and the vehicle operators, ensuring that everyone involved can see and respond appropriately, reducing the risk of accidents. In emergencies, clear communication and visibility are paramount to managing the situation effectively.

The other options present alternatives that lack the necessary safety considerations for a low-visibility scenario, which is why they are not the best choices. For example, driving without a guide does not provide the necessary oversight to ensure the vehicle's safety and direction in potentially hazardous conditions. Waiting for tower permission could delay response times, which is critical during emergencies. Parking vehicles immediately may obstruct emergency operations or contribute to confusion on the airfield. Thus, utilizing a walking guide with a luminescent wand not only ensures safety and direction but also promotes effective communication during crucial moments.