From April 1st 2016, all heavy goods vehicles of more than 3.5 tonnes must have a working On Board Unit (OBU) in Belgium.
An OBU is only required if the tractor unit has a gross vehicle weight (GVW) of over 3.5 tonnes. The point of reference for the definition of the weight that needs to be registered in the system is the Gross Combination Weight Rating (GCWR).
This toll will be levied on motorways and a number of regional and municipal roads. The OBU must be switched on whenever you use a Belgian road. The system is based on the ‘user pays’ principle. This means that everyone pays