Samband mellan vägbelysningsnivå och spontant vald hastighet: förstudie


If something in the road environment is improved, there is always a risk that the drivers will compensate for the better conditions by increasing speed. As an example, one study showed that the introduction of delineator posts in Finland increased the average speed by as much as 10 km/h on curvy roads. Another study, carried out in Norway, showed an increase in speed of 1 – 5 per cent when road lighting was put up. Therefore, one reasonable hypothesis is that speed will increase with increasing lighting level. The primary purpose with this study was to test a method for measurement of spontaneous choice of speed related to lighting level. This means studying the speed chosen by a driver when he or she is not disturbed by other traffic. Space mean speed was measured by the use of an instrumented vehicle which could register speed continuously. Furthermore, this vehicle was equipped with a video front camera which made it possible to afterwards reject measurements which were not undisturbed. Each subject drove the test road, which had an illumination level of 0 to 30 lx, at off-peak hours both in daylight and darkness. The speed limit on all test sections was 50 km/h, all sections dry and illuminated on one side, only. However, one section had no stationary lighting at all. The method for data collection worked out, but was slow. The results show a weak, but clear tendency to higher speed with higher illumination level. The number of subjects, six, were small, therefore significant results should not be expected.



ERPUG 2017

The five year anniversary of  European Road Profile Users' Group (ERPUG) Forum will take place at Ramboll head quarter, Copenhagen, Denmark October 19-20, 2017. 

Shipping and the environment – research meets reality

Centre for Transport Studies (CTS) in co-operation with Ports of Stockholm invite you to the seminar Shipping and the environment – research meets reality.




The five-year anniversary of European Road Profile Users' Group (ERPUG) Forum will take place at Ramboll head quarter, Copenhagen, Denmark October 19-20, 2017.


Self-driving buses in Sweden next year?

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Tomas Svensson new director-general

Tomas Svensson was today appointed Director-General of VTI. Tomas has been acting Director-General since January 2017.