Knowledge base
- Developments
- Sustainable Safety
- Road safety policy
- Modes of transport
- High-risk groups
- High-risk behaviour
- Measures
- Data sources
- Ownership and use of commercial vehicles (CBS)
- Population of the municipalities in the Netherlands (CBS)
- Causes of Death (CBS)
- Use of protection devices
- International Road Traffic and Accident Database IRTAD
- IIS (Injury Surveillance System)
- National Medical Registration (LMR)
- National Road Database (NRD)
- Injuries and Physical Activities in the Netherlands (OBiN)
- National Travel Survey (NTS)
- Car Panel PAP (CBS)
- Periodic Regional Road Safety Survey (PRRSS)
- Survey of drinking and driving in the Netherlands
- Speed measuring on motorways
- Road Statistics (CBS)
- Motor Vehicle Statistics (CBS)
- Passenger Traffic Statistics (CBS)
- Road crash registration (BRON)
- Traffic Offences
Measuring method
Speed measuring has been carried out since 1988. For this purpose a selection of locations is used. This selection used to consist of 4 locations with a 100 and 10 with a 120 km/h limit. In mid-2007 the number of locations has been increased to 8 with a 100 and 21 with a 120 km/h limit (see map below).
These locations were chosen from the total of 100 locations based on their being located on undisturbed road sections with a good traffic flow. Therefore, after testing against the requirements, locations on slip roads, in the immediate vicinity of bridges, tunnels etc. have been excluded. Average speeds per hour are determined which are then calculated into monthly averages.
Figure 1 Locations for speed measuring ( round=added per mid-2007).
The measuring equipment which is used gives the averages of all values measured per period of 60 minutes (an hour). If during one hour the average car speed is below
This calculation method has been used since 1994. Before that year, a somewhat different method was used. For those years, SWOV, together with the Directorate-General for Public Works and Water Management, applied a conversion factor, so that a longer time span is still available.
It must be noticed that the sample of 100 km/h locations is rather small. This can be the cause of accidental fluctuations.
Furthermore, the data shows that the average speed of solo lorries on roads with a 120 km/h limit is not only considerably higher than the maximum allowed speed for lorries, but is increasing. This is probably due to an increasing number of delivery vans with a length that just puts them in the lorry category (>5,60m). However, the maximum speed for these vans on motorways is that of cars: 100 and 120 km/h.
Publications
Herijking Voertuigcategorieën Wegverkeer. Adviesdienst Verkeer en Vervoer. Rapportnummer BG-3700. Januari 2001.