Vehicles operating within 25 feet of an aircraft or 50 feet of a facility must reduce speed to what?

The correct choice states that vehicles operating within 25 feet of an aircraft or 50 feet of a facility must reduce their speed to 5 MPH. This regulation is crucial for maintaining safety in areas where aircraft are present. At such close distances, the potential for incident or accidents increases significantly due to the size and operational characteristics of aircraft. Reducing speed to 5 MPH allows drivers to have greater control of their vehicles, enhancing their ability to stop quickly if necessary and ensuring they can respond to unexpected situations, such as aircraft movement or personnel in the vicinity. This precautionary measure emphasizes the importance of situational awareness and caution around operational aircraft and specific facilities, helping to prevent accidents and ensure the safety of all personnel on the airfield.