What is the maximum visibility under which no vehicles other than emergency vehicles are allowed on the airfield?

The maximum visibility under which no vehicles other than emergency vehicles are allowed on the airfield is indeed 100 feet. This regulation is in place to ensure safety and minimize the risk of accidents in low visibility conditions, where the ability to see the runway, taxiways, and other vehicles or personnel is severely impaired. When visibility drops to 100 feet or below, the risk of collisions increases significantly, making it essential to restrict airfield access to only those vehicles that are necessary for emergency response, such as fire trucks, ambulances, or other first responders.

In such situations, emergency vehicles are trained and equipped to operate under poor visibility with special protocols to ensure safety. The rule safeguards both vehicle operators and airfield personnel by limiting the number of vehicles in operation, thereby reducing the potential for mishaps during critical low visibility circumstances.