What is the difference between zGG and tzGm (as of December 1, 2023)?
The zGG (gross vehicle weight) and the tzGm (technically permissible maximum mass) both refer to the maximum mass that a vehicle is permitted to carry or tow. However, these terms differ in their precise meaning and legal or technical implications.
zGG (gross vehicle weight)
- The zGG represents the maximum total weight of a vehicle that is legally permitted on public roads. It includes the vehicle’s curb weight as well as its maximum payload.
- The zGG is generally prescribed by law and must not be exceeded under any circumstances.
- Compliance with the zGG is essential for road safety and the protection of the road infrastructure, as it helps to ensure that vehicles are not overloaded.
tzGm (technically permissible maximum mass)
- The tzGm refers to the maximum technically permissible mass of a vehicle, including its load. In contrast to the zGG, the tzGm does not take into account the weight of the occupants. It relates to the maximum mass that the vehicle can carry in accordance with the manufacturer’s technical specifications.
- The tzGm takes into consideration the load-bearing capacities of various vehicle components, such as the frame, axles, wheels and brakes, and thereby ensures that the vehicle can be operated safely without overloading these technical components.
Summary
In summary, the zGG constitutes the legally defined limit for the total weight of a vehicle on the road, whereas the tzGm defines the technically permissible mass that the vehicle may carry according to the manufacturer’s specifications. It is essential to observe both limits in order to ensure the safety, reliability and durability of the vehicle.
What changes from December 1, 2023?
From December 1, 2023, the tzGm (technically permissible maximum mass, registration certificate Part 1, field “F.1”) will be used instead of the zGG (gross vehicle weight, registration certificate Part 1, field “F.2”) as the basis for toll calculation.
Transition period
Vehicles with a tzGm exceeding 3.5 t, which were registered before December 1, 2023 and had a zGG of no more than 3.5 t prior to that date, may continue to purchase vignettes and route-based tolls for vehicles up to 3.5 t tzGm until January 31, 2029.
