What is the mandatory requirement regarding wheel chocks (pykat e rrotave / kallat) for heavy commercial vehicles in Albania?

1. Wheel chocks are optional accessories only required for agricultural tractors
2. They must be thrown into the cabin footwell to rest the driver's feet
3. They are used only to prop open warehouse loading doors
4. Heavy commercial vehicles must carry at least one (and combinations two) certified wheel chocks, which must be placed against the wheels when parking on grades or during breakdown