Who has stopped incorrectly?

You chose correctly that the red car has stopped incorrectly. In German traffic rules, it is prohibited to stop directly on pedestrian crossings (Zebrastreifen), as this blocks pedestrians from safely crossing the street and can cause dangerous situations. The red car is stopped right on the crossing, which is not allowed.

The yellow car, however, has stopped before the pedestrian crossing, respecting the law and giving pedestrians the right of way. Always stop before the pedestrian crossing to allow safe crossing and comply with German traffic regulations. This is important to avoid accidents and ensure pedestrian safety.