In Austria, a toll is due for road vehicles with a total weight of more than 3.5 tonnes (all trucks, buses and heavy goods vehicles) and is collected through a DSRC-based toll system on motorways and speed roads.
Variable vehicle parameters to be declared by the on-board unit:
The current number of axles of an attached trailer
It is forbidden to drive a vehicle that is subject to toll payment without paying it. The driver must carry a "Vehicle Declaration" document on board of the truck during the journey and present it for inspection upon request from the authorities.