Field test on visibility at cycle crossings at night

Faltstudie pa synbarhet vid cykeloverfarter i morker

The subject of this report is a field study, which is part of the project "Road user support in night-time traffic." A literature review on night-time traffic was conducted in urban areas, and a focus group study discussed road users' needs and experiences in this area. Comparing the night-time visibility distance of cycle crossings to the night-time visibility distance of bicyclists at the corresponding cycle crossings was the aim of the field study. This was tested both for wet and dry road surfaces. Illuminance, daylight luminance coefficient and retroreflectivity were the physical parameters measured in the field study. The contrast between the road surface and marking was calculated from these measures, as well as the difference between the illumination at the front and at the back of the bicyclist dummy. The primary result of the study was that the bicyclist dummy was always seen at longer distances than the cycle crossing. Yet, the difference in detection distance with and without the bicyclist dummy varies over crossings. Between physical parameters and visibility only weak correlations could be shown. For both dry and wet road surfaces the results are the same.


  • English
  • Swedish

Media Info

  • Media Type: Print
  • Features: Appendices; Figures; Maps; Photos; References; Tables;
  • Pagination: 51p

Subject/Index Terms

Filing Info

  • Accession Number: 01357005
  • Record Type: Publication
  • Report/Paper Numbers: VTI rapport 691A
  • Files: TRIS, ATRI
  • Created Date: Nov 1 2011 2:30PM