Samband mellan hastighet och belysning

Samband mellan hastighet och belysning

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The relationship between spontaneous choice of speed and lighting level on streets with stationary light has been studied. On ten streets in Linköping, the speed of cars which were not disturbed by other traffic, was measured. These measurements were carried out both during daylight and darkness conditions, where the daylight condition measurements were used as reference. The dependent variable was the difference between speed in daylight and darkness. The hypothesis was that this difference would be high (including sign) on streets with high illuminance level and low on streets with lower lighting level. One important question was if low lighting levels would result in lower speeds that would compensate for the worse visibility of objects in or close to the street. If so, there would be a positive effect on energy and environment without making impairing traffic safety.

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