If a vehicle is equipped with the LPG installation and this fact is noted by the authorities of a given country in the vehicle’s registration documents, then Bundesamt für Güterverkehr assumes that the diesel + gas installation is legal. But if the control determines that in the installation there are some defects that may cause danger for the driver or other participants of the road, than the vehicle may be stopped until the defect eliminated. It should be taken into consideration that LPG/CNG is a dangerous product. If the total capacity of all vehicle’s tanks (diesel and gas) on a unit (truck and semitrailer) does not exceed 1500 liters, then it is exempted from the ADR regulation.