Samband mellan vägbelysningsnivå och spontant vald hastighet: förstudie

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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.

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