Kantstolpars effekt på trafikantbeteendet

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Thomas Engen
Riikka Rajamäki
Gabriel Helmers

In order to improve the visual guidance in night-time traffic most Nordic roads are equipped with delineator posts. The configuration of these posts vary between the countries; as an example the distance between two delineator posts is 100 metres in Denmark, while it is 50 metres in Sweden. The aim of the present study was to investigate which delineator post configuration that gives the best driving behavior. Furthermore, the optimal visibility distance of the retro-reflector of the post was estimated. The results can be used for a harmonization of the Nordic regulations regarding delineator posts. The study was conducted in the VTI and SINTEF driving simulators. The study of configuration (VTI) was validated on the real road in Finland by VTT. In the VTI simulator subjects drove in the dark a loop containing seven different delineator posts configurations, while the study at SINTEF used a loop where the retro-reflectors of the posts had a night-time visibility distance of 100, 200 or 400 metres. In both simulators the speed was registered continuously. The results show that the configuration which today is used in Denmark is to prefer. This configuration gives equal or better driving behavior than other configurations, but to a lower price. The optimal visibility distance of the retro-reflectometer was estimated to 100-200 metres.

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