During a low visibility situation, when is it necessary to reduce speed?

Reducing speed in all instances of low visibility is essential for several reasons. Low visibility conditions can significantly impair a driver's ability to see other vehicles, obstacles, and signage, thereby increasing the risk of accidents. By reducing speed, a driver has more time to react to unexpected situations, such as other vehicles appearing suddenly or changes in the layout of the taxiway.

Driving at a reduced speed allows for better control of the vehicle, enabling the driver to stop or maneuver as necessary when visibility is compromised. Additionally, following this guideline ensures compliance with safety regulations that prioritize the well-being of all individuals in and around the airside environment.

While the other options suggest circumstances where speed might be adjusted, they do not encompass the comprehensive safety imperative that applies to all low visibility situations. For instance, only operating in crowded areas or waiting for specific visual cues from other vehicles can still leave a driver unprepared for unforeseen obstacles. Similarly, depending solely on air traffic control advisories does not account for the immediate changes in conditions that the driver may encounter. Thus, the most prudent action is always to reduce speed whenever visibility is low.