Which of the following statements is NOT true regarding airfield operations?

The statement about reducing speed to 15 MPH when visibility is 300 meters is considered not true because specific speed restrictions are often dictated by airfield standards, and visibility conditions may not always prescribe such a uniform speed limit. In many cases, the actual speed limit could vary depending on the specific airfield regulations, the type and size of the aircraft operations underway, as well as local procedures. Therefore, it is essential to consult the regulations pertinent to a specific airfield to determine appropriate speed limits for varying visibility conditions rather than applying a blanket speed limit based on visibility alone.

Understanding why the other statements are accurate aids in distinguishing sound airfield operation practices. For instance, the restrictions on using cell phones near fuel vent outlets emphasize safety protocols to minimize ignition risks related to fuel vapors. Regarding the VFR hold line, it accurately marks the point where a vehicle must stop to avoid entering the runway environment without clearance, enhancing safety around airport operations. Lastly, driving single-file on taxiways is essential for maintaining safe separation between vehicles and ensuring smooth operations around active areas. This ensures that air traffic can function seamlessly without being hindered by vehicular traffic.