* Particulate reduction classes are retrofitting standards to lower particulate emissions. Particulate reduction class 1 or higher is required for category D; for category C, particulate reduction class 2 or higher is required.
The tandem axle counts as two axles, the tridem axle counts as three axles. Lift and retractable axles are always taken into account, regardless of whether a vehicle axle is being used or is lifted during transportation, in other words has no road contact.
The road user subject to toll must prove the accuracy of all relevant data for toll collection when requested by the Federal Office for Goods Transport (BAG) by showing appropriate documents (Section 5 of the German Federal Trunk Road Toll Act (BFStrMG) in conjunction with Sections 6 and 2 of the German Truck Toll Regulations).
For domestic vehicles registered in Germany using standard EU vehicle documents, the emission class can be identified based on the text in section 14 or the key number for 14.1 (Section 7 German Truck Toll Regulations).
For vehicles registered outside of Germany, time-based presumptions apply if the emission class cannot be proven in another way, in particular with documents attesting the fulfilment of certain environmental requirements in ECMT transport (European Conference of Ministers of Transport), (Section 8 of the German Truck Toll Regulations).
The road user subject to toll is responsible for demonstrating and proving all data relevant for toll collection. Failure to provide proof will be penalised with a fine.