Before which sign must you maintain a distance of at least 10 m, if it would otherwise be concealed by your vehicle?

You answered correctly. German traffic rules require that certain important signs must always be clearly visible to all road users. Before the diagonal cross (sign for railroad crossings) and the stop sign, you must leave at least 10 meters distance when parking if your vehicle would cover the sign. This is because both signs warn drivers of danger—railroad crossings and stopping requirements—so visibility is essential for safety. The no stopping sign does not require this minimum distance, as its purpose is already to prevent parking or stopping nearby. Knowing which signs need to remain visible helps prevent dangerous situations and ensures everyone understands the road conditions ahead.