With which vehicles are you not allowed to drive on a road sign-posted like this?

This traffic sign indicates a length restriction: vehicles and vehicle combinations longer than 10 meters are not allowed to enter. In your answers, vehicles 1 and 2 both exceed this length limit, so they are not permitted. The truck in answer 3 is only 9 meters long, so it is allowed. Always check both the total length of the vehicle (including any trailers) and the specific restriction shown on the sign to determine if access is permitted.