If the towed vehicle, after being attached to the towing vehicle by its dimensions, does not allow the driver a proper view through the outside rear-view mirrors:
Such a road train can be used in road traffic only on roads of the 1st and 3rd class and local roads .
Such a road train can be used in road traffic .
The traction vehicle must be equipped with additional long-reach rear-view mirrors or other equipment that provides adequate visibility .