What do you have to be aware of when you see with this traffic sign?

This traffic sign means “No stopping” (absolutes Halteverbot). When you see this sign, you are not allowed to stop your vehicle at all, not even to let passengers in or out, or to load or unload your car. Even a brief stop is forbidden. The only exception would be if you are forced to stop by traffic conditions, such as waiting in a traffic jam.

So, answer 1 is correct: you may not stop at all when this sign is present. The other answers are incorrect because stopping for any reason—even briefly—is not allowed. This is stricter than a “No parking” sign, which would allow a short stop for drop-off or loading. Always remember: with this sign, stopping is not permitted under any circumstance.