What is a potential risk when taxiing if fog is present?

When taxiing in fog, reduced situational awareness is a significant concern because the fog restricts visibility. Pilots rely on visual cues to maintain spatial orientation, navigate the taxiways, and interact appropriately with ground traffic and other hazards. When visibility is limited, as in foggy conditions, it can be challenging for pilots to see other aircraft, vehicles, or personnel on the ground. This limitation can lead to mistakes, such as misjudging distances or failing to notice other aircraft or obstacles, which dramatically increases the risk of accidents or collisions during taxi operations.

In such conditions, maintaining proper communication with air traffic control becomes even more critical, as they can provide guidance and information about traffic and potential hazards that the pilot may not be able to see. Although other options suggest varying levels of impact, they do not accurately address the direct effect of fog on a pilot's ability to perceive their surroundings, making reduced situational awareness the most concerning risk.