You are driving outside built-up areas. Visibility is reduced to just about 50 m due to heavy rain. What applies in this situation?

Your answer is correct because when visibility is very limited outside built-up areas (about 50 meters due to heavy rain), German traffic rules require drivers to reduce speed to a maximum of 50 km/h to ensure safety. Additionally, overtaking by heavy motor vehicles (those over 7.5 tons) is prohibited in such conditions to prevent accidents. The rear fog lamp, however, is not mandatory in this situation unless visibility drops below 50 meters, and it should only be used if visibility is severely impaired to avoid dazzling other drivers. Understanding these rules helps maintain safety during poor visibility on rural roads.