National Road Database (NRD)

The NRD is a digital database of just about all roads in the Netherlands. All roads that are managed by road authorities: the state, provinces, municipalities, and water boards are included, but only if they have a street name or number. This means that separate footpaths and bicycle tracks and unsurfaced roads are also included if they have a street name. If a road has a dual carriageway, they are processed in the database as separate road segments.


The geometry of the NRD is identical to the centre lines of the TOP10maps database of the Dutch Ordnance Survey. Therefore the geometrical accuracy is the same as maps with a scale of 1:10,000.


The NRD is a network consisting of junctions joined together by road segments.

A junction can be:

A logical consequence of this method is that a large number of road segments are essential to form such a network.

The NRD 2005, therefore, consists of 895,789 road segments and 643,071 junctions.


Figure 1. Example of road segments and junctions




The NRD is particularly important because it links various data sources to one another:

That makes it possible to analyse road safety in relation to the traffic volume and the features of the infrastructure.