In order to calculate the correct toll, the OBU uses an internal map that contains all of Belgium’s roads. An algorithm (called map matching) links GPS positions to this map and calculates the route along which the lorry is driving, based on the roads on the map.
If the lorry is driving on a private road, there are two possibilities:
(1) the private road is known on the map and the OBU displays “toll free” because it is located on a private road. In this situation a toll is never charged.
(2) the private road is missing from the map. In this situation there is a chance that the OBU will erroneously charge a toll, if all of the following conditions are met:
- The private road is in close proximity to another road which is a toll road (< 20 Meter)
- Movement along the road is parallel (and not perpendicular).
If these conditions are met, there is a possibility that the map matching algorithm will calculate that the OBU is on a toll road, despite the OBU’s actual location being on a private road or car park. In most cases, the total additional toll is limited to a few metres at the edge of the car park and parallel to the other road.
The simplest way of solving this technical issue is for Satellic to update the OBU’s map with the private road.
Using aerial photography as a basis, Satellic has proactively conducted a screening for an update of all roads near toll roads. This information will be available on the OBU as from version 5.14 (and newer). However, it is possible that some roads haven’t been updated during the intensive screening. In that case, your best course of action is to contact the Satellic HelpDesk with a detailed description of the location (address, coordinates or a map) of the road or car park’s exact whereabouts. Satellic will verify this information on the map, and if necessary add it to the map as soon as possible. In this way OBUs can avoid charging a toll on these roads in the future.