The StVO § 22 states:
"(1) Cargo, including load securing devices, and loading devices shall be stowed away and secured so that they can not slip, fall over, roll over, fall or generate avoidable noise even during emergency or sudden evasive maneuvers to observe recognized rules of technology.
(3) The cargo shall not project forward over the vehicle up to a height of 2.50 m, or over the towing vehicle in the case of trains. Incidentally, the cargo overhang may be up to 50 cm forward over the vehicle, for trains up to 50 cm above the towing vehicle. (...) "
- nie nach vorn über das Fahrzeug hinausragen
Cargo may protrude from a height of 2.5 meters up to 50 cm above the vehicle.