Why should you keep well back from the vehicle in front when driving in fog?

Maintaining a safe distance from the vehicle in front of you while driving in fog is crucial due to the reduced visibility that fog creates. When visibility is compromised, it becomes more challenging to perceive the actions of the vehicle ahead, including sudden stops. By keeping a greater following distance, you ensure that you have enough time and space to react if the vehicle in front needs to stop unexpectedly. This helps prevent collisions in foggy conditions, where reaction times may be delayed due to limited sight lines.

The other options, while they may address important considerations in driving, do not specifically relate to the immediate concerns posed by fog. For instance, allowing others to overtake safely is generally a consideration in clear conditions where visibility is not an issue, and creating a safe lane for emergency vehicles may be more relevant in congested traffic situations rather than specifically in fog. Preventing water splashes is more relevant in wet conditions rather than in fog, where visibility is the primary concern. Therefore, focusing on maintaining an adequate distance for safety is vital in foggy situations.