You are driving in dense fog on a federal road (Bundesstraße) outside a built-up area. Are you allowed to drive in the middle of the road continuously straddling the broken white line?

You answered correctly because driving continuously in the middle of the road, straddling the broken white line, is not allowed in dense fog outside built-up areas. This behavior poses a danger to oncoming traffic who might be confused or forced to react suddenly. According to German traffic rules, you must stay on your lane and keep as far to the right as safely possible. Even with fog lamps on, the road markings and lane discipline must be respected to maintain safety for everyone on the road. Straddling the line is not a permitted way to reduce risk; instead, you should slow down and ensure your visibility and position comply with normal traffic rules.