Up to which height is it permitted to load loose materials?

1. Up to the height of the rear door of the freight trunk.
2. Correct answer: Up to the height of the walls of the truck, including the vehicle’s ladders.
3. Up to the height of the rear window of the driver’s compartment.
4. Up to the height of the walls of the freight trunk, excluding the vehicle’s ladders.

WhyLoose materials may be loaded up to the height of the truck's sides, including legally installed extensions. Higher, they will spill onto the road.