Which vehicles are not allowed to overtake here?

This traffic sign indicates a no-overtaking zone specifically for trucks and similar heavy vehicles. In Germany, it means trucks with a permissible total mass over 3.5 tons and truck tractors are not allowed to overtake other vehicles. Regular cars are not affected by this restriction and may overtake if it is otherwise safe. You correctly selected the answers that match the vehicles affected by this rule. The purpose of this regulation is to improve traffic flow and safety, especially on roads where large vehicles overtaking can cause dangerous situations or slowdowns.