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

In heavy rain with visibility reduced to about 50 meters outside built-up areas, you must not drive faster than 50 km/h. This is a general rule that ensures you can stop safely if needed within your visible distance. Additionally, overtaking is prohibited for motor vehicles with a total mass over 7.5 tons in such limited visibility, because overtaking would be too dangerous. The rear fog lamp, however, is not required until visibility drops below 50 meters—so that rule does not apply in this exact situation. Your answers were correct, and remembering these limits helps keep everyone safer in poor visibility.