The road characteristics database (WKD) for speeds contains speed limits for all roads in the NWB. At the beginning of 2017, WKD was filled for the whole of the Netherlands with data supplied by municipalities. From that moment on, the new traffic decrees, via the Knowledge and Exploitation Center for Official Government Publications (KOOP), have been used to detect and process changes in speed limits. The NWB changes faster than the speed limits are supplied by the road authorities or are placed in KOOP. Algorithms are used to supplement the speed where necessary at short intermediate road sections. As a result, the speed limit is unknown for a few percent. Since 2022, the characteristics Trees, Entrances, Bowl boundaries, Parking points, Parking spaces, Traffic center, Traffic types, Road width, Road categorization and Road narrows have been added to the database as a csv file. These can be downloaded from https://downloads.rijkswaterstaatdata.nl/wkd/. Documentation about the wkd features can also be found here. NB: In residential areas where a maximum speed of 30 km per hour applies, or a residential area, this leads to major deviations from reality. Since 2017, the number of rural roads with a 60 km limit has also increased sharply. The possible speeds that can be entered are 5, 15, 20, 30, 40, 50, 60, 70, 80, 90, 100, 120, 130 km/h and unknown. The speeds only apply to roads that are open to car traffic. On bicycle paths, footpaths and other roads that are not open to car traffic, the speed is entered as unknown. This also applies to the ferry connections. The file provides variable speed limits with a start time and an end time. These apply in particular to motorways. Outside this period with the indicated start time and end time, an alternative speed will apply. So for example between 06:00 and 19:00 100 km/h applies and outside that time the maximum speed is 120 km/h. The road characteristic database for speeds also contains the recommended speeds that apply to a particular road section or part thereof. More information and news about the NWB can be found at https://nationaalwegendossier.nl/
