DETERMINATION AND MEASUREMENT OF THE REFLECTIVE BEHAVIOUR OF ROAD SURFACES UNDER THE INFLUENCE OF VEHICLE LIGHTING
BESTIMMUNG UND MESSTECHNISCHE ERFASSUNG DES REFLEXIONSVERHALTENS VON FAHRBAHNOBERFLAECHEN BEI KFZ-EIGENER BELEUCHTUNG
In this project, the reflective behavior of road surfaces under the influence of vehicular lighting was examined. Study of the relevant literature describes the results achieved until now for the reflective behavior of these road surfaces. The majority of studies carried out have concentrated on reflective behavior caused by stationary road lighting. The relationships of special vehicle geometry with small angles for illumination and observation as well as measuring distances of up to 100 m (328 ft), have never been considered in detail. It was possible to calculate the dependency of the luminance factor for illumination and observation angles which are present with the vehicle geometry in laboratory tests. The tests were supplemented with outside measurements. To measure the index values, a new kind of luminance measuring systems was used. This system facilitates high resolution measurement of road surface luminance values. To carry out outside measurements easily, a portable reflectometer for road surfaces was developed. A criterion for the designation of reflective behavior of road surfaces under the influence of vehicular lighting has been proposed. This is based on the correlation of the surface luminance factors in forward and reverse direction at various geometries. A simple method for describing the characteristics of reverse reflection from dry road surfaces was set up as well.
Heusch/Boesefeldt G.m.b.H.Aachen, Germany
- Schmidt-Clause, H J
- Wambsganss, H
- Publication Date: 1993-12
- Pagination: 65 p.
- TRT Terms: Lighting; Luminance; Reflection; Vehicle lighting
- Old TRIS Terms: Reflecting surfaces; Reverse reflection; Road lighting
- Subject Areas: Highways; Pavements;
- Accession Number: 00731942
- Record Type: Publication
- Files: TRIS
- Created Date: Feb 5 1997 12:00AM