Heldragen kantlinje på tvåfältsväg: hastighet och synbarhet


The aim was to investigate whether travel speed on two lane roads is influenced by the type of edge line. Another aim was to investigate whether there is a difference in durability for different line types. The study was carried out on a rural road segment. In year one, the entire road segment had a continuous edge line. In year two and three, half the segment had a continuous edge line, while the other half had a broken edge line. Travel speed of free flow passenger cars was measured each year, both in daylight and at night. The function of the edge lines was measured in terms of retroreflection and luminance coefficient. The results showed that the type of edge line did not have an influence on travel speed, neither in daylight nor at night. The preview time was significantly higher for the continuous than for the broken edge line. No difference in durability between the two line types could be observed during the two years the study was carried out. From a traffic safety and comfort perspective, the results point toward the use of continuous edge lines on two lane roads, at least on hilly and curving roads.



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