When are you not allowed to park on the right-hand lane?

You answered correctly because German traffic rules prohibit parking on the right-hand lane in these specific situations to ensure safety and traffic flow. First, if there is an adequately paved hard shoulder next to the lane, parking should occur there instead, keeping the driving lane clear. Second, if rails (such as tram or train tracks) are integrated into the road lane, parking is not allowed on that lane to avoid obstructing public transport. Third, if there is a designated parking lane to the right of the road lane, vehicles must park there rather than on the driving lane itself. These rules help maintain clear lanes for traffic and emergency vehicles and prevent hazards. Understanding these points will help you recognize when parking on the right-hand lane is prohibited.