The dependence of the specific luminance of dry road markings on observation and illumination angles was investigated. Laboratory measurements on nine different road sections were carried out. The geometries of the measurements have been chosen in such a way that they simulate observation distances between 10 and 100 metres, observer eye heights 1.0, 1.2 and 1.5 metres and headlight mounting height 0.65 metres. The results indicate that at any observation distance the specific luminance is lower, the larger the observer eye height is, which could be expected at least from road markings containing retroreflective micro-pearls. Further on, those samples with drop-on micro-pearls show an initial increase in specific luminance up to a maximum at 15 to 30 metres observation distance. At larger distances the specific luminance decreases. From the results it can also be concluded that a simple relationship of variation of the specific luminance with the distance on the road does not exist. The report also contains discussion and analysis of the results, including comparison to measurements carried out in Belgium and Denmark. (Authors)

Media Info

  • Features: Figures; References; Tables;
  • Pagination: 37 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00322665
  • Record Type: Publication
  • Report/Paper Numbers: Nr 189A, HS-030 045
  • Files: HSL, TRIS, ATRI
  • Created Date: Mar 12 1983 12:00AM