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Vägutrustningars effekt på trafiksäkerhet, tillgänglighet och komfort : en körsimulatorstudie rörande effekten av mittlinje respektive kantstolpar Ihs, Anita

By: Series: VTI rapport ; 551Publication details: Linköping VTI, 2006Description: 34 s. + bilOther title:
  • The effect of road equipment on traffic safety, accessibility and comfort - A driving simulator study regarding the effect of centre line and guide posts respectively
Subject(s): Online resources: Bibl.nr: VTI P0654:551Location: Abstract: The background to this project is that the Swedish Road Administration has put forward a suggestion that there should be no centre line on roads with a width less than 6,5 m. Furthermore, the suggestion also is that one should stop cleaning the guide posts on roads equipped with these, i.e. the reflexes on the guide posts will in principle not be functioning during winter and in darkness. To investigate the effect for the road users during driving in darkness of removing the centre line and having guide posts that in principle are not visible in darkness, respectively, a driving simulator study has been carried out. The two above mentioned road types, i.e. an 8 m wide road with/without guide posts and with posted speed limit 90 km/h and a 6 m wide road with/without centre line and with posted speed limit 70 km/h, respectively, have been studied in two separate driving tests. A total of 30 subjects have driven both road types during darkness under conditions corresponding to both dry and wet road surface, alternatively new and worn road markings, i.e. with road markings that are visible on a long distance or only on a short distance. The study showed among other things that when the road markings fulfil the requirements for visibility given in the regulations the speed is only slightly influenced by whether there are guide posts or not. On the other hand, if the visibility of the road markings is poor one uses the visual guidance from the guide posts to be able to drive at a higher speed. In the former case the mean speed was about 2 km/h lower without guide posts while the corresponding speed reduction was about 10 km/h in the latter case. Furthermore, the mean speed was about 6 km/h lower when the road didn't have a centre line than when it had a centre line. The mean speed was the lowest when the road had no centre line and the visibility of the edge line at the same time was poor. The test subjects also "reeled" more across the roadway, consciously or not, when the road didn't have a centre line than when it was provided with a centre line.
Item type: Reports, conferences, monographs
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The background to this project is that the Swedish Road Administration has put forward a suggestion that there should be no centre line on roads with a width less than 6,5 m. Furthermore, the suggestion also is that one should stop cleaning the guide posts on roads equipped with these, i.e. the reflexes on the guide posts will in principle not be functioning during winter and in darkness. To investigate the effect for the road users during driving in darkness of removing the centre line and having guide posts that in principle are not visible in darkness, respectively, a driving simulator study has been carried out. The two above mentioned road types, i.e. an 8 m wide road with/without guide posts and with posted speed limit 90 km/h and a 6 m wide road with/without centre line and with posted speed limit 70 km/h, respectively, have been studied in two separate driving tests. A total of 30 subjects have driven both road types during darkness under conditions corresponding to both dry and wet road surface, alternatively new and worn road markings, i.e. with road markings that are visible on a long distance or only on a short distance. The study showed among other things that when the road markings fulfil the requirements for visibility given in the regulations the speed is only slightly influenced by whether there are guide posts or not. On the other hand, if the visibility of the road markings is poor one uses the visual guidance from the guide posts to be able to drive at a higher speed. In the former case the mean speed was about 2 km/h lower without guide posts while the corresponding speed reduction was about 10 km/h in the latter case. Furthermore, the mean speed was about 6 km/h lower when the road didn't have a centre line than when it had a centre line. The mean speed was the lowest when the road had no centre line and the visibility of the edge line at the same time was poor. The test subjects also "reeled" more across the roadway, consciously or not, when the road didn't have a centre line than when it was provided with a centre line.