From 1 January, only trucks with a test drive plate will not be subject to the kilometer charge. Trucks with one of the other three number plates will be required to have an activated OBU on board on Belgian roads.
Since April 1 2016, the Kilometer Charge applies for HGVs of over 3.5 tons and for N1 trucks with body code BC. All these trucks need to be equipped with an On Board Unit that is constantly switched-on when they drive on public roads. This OBU will only charge the kilometers driven on paying toll roads.
On this website you will find all information on the the Kilometer Charge and answers on questions like:
The correct use of the On Board Unit is being monitored, and fraud or non-use will be fined.