What must you do on encountering sudden dense fog driving at daytime?

When driving in sudden dense fog during the daytime, it is important to prioritize safety by following specific guidelines. According to German traffic regulations, you must immediately adapt your speed to match the visibility conditions. This is critical as reduced visibility can lead to dangerous situations.

Additionally, switching on dipped headlights is necessary. Dipped headlights enhance your vehicle's visibility to other drivers and make it easier for you to see the road ahead. In dense fog, relying solely on parking lights is insufficient, as they do not provide adequate illumination and may confuse other drivers.

By complying with these rules, you ensure not only your safety but also the safety of other road users, as clear communication through visibility is vital in hazardous conditions.