REFLECTION PROPERTIES OF ROAD MARKINGS IN VEHICLE HEADLIGHT ILLUMINATION
With the purpose to investigate how the specific luminance of dry road markings depends on observation- and illumination angles, laboratory measurements on nine different road samples have been carried out. The geometries of the measurements have been chosen in such a way that they simulate observation distances between 10 and 100 meters, observer eye heights 1.0, 1.2 and 1.5 meters and headlight mounting height 0,65 meters. 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 meters 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.
- Also pub. as ISSN-0347-6030. Prepared in cooperation with Danish Illuminating Engineering Lab., Lyngby.
- Lundkvist, S O
- Sorensen, K
- Publication Date: 1980
- Pagination: 43 p.
- TRT Terms: Distance; Field tests; Lighting systems; Luminance; Pavements; Perception; Roads
- Old TRIS Terms: Illuminating; Markers
- Subject Areas: Highways; Pavements; Safety and Human Factors;
- Accession Number: 00329150
- Record Type: Publication
- Source Agency: National Technical Information Service
- Report/Paper Numbers: VTI-189A
- Files: NTIS, ATRI
- Created Date: Jun 12 1981 12:00AM