It may at first seem strange to find “road surfaces” dealt with under the heading “Equipment”. But the luminance of the road surface is an important quality-determining factor with regard to both visual performance and visual comfort. That luminance is determined by the amount of light directed towards the road surface from the lamps and luminaires and reflected by that road surface in the direction of the motorist. So the lamp, luminaire and reflection properties of the road surface together determine the final lighting quality. By tuning the lamp, luminaire and road surface to each other, the light needed from the lamp-luminaire combination can be minimized. The reflection properties of the road surface thus influence both the lighting quality and the cost and energy effectiveness of a road-lighting installation. Unfortunately, a theoretical approach to the reflection properties of road surfaces has not led to a workable system for describing these properties. So far as road lighting is concerned, however, it is possible to work with a simplified description system, the so called Q0-S1 system. A classification system for road surfaces, based on this description system, can be used to facilitate all calculations met with in road lighting. This description and classification system will be described in this chapter. The ways in which the values of Q0 and S1 can be obtained for a particular road surface will be discussed as well.
Equipment: Road Surfaces
Road Lighting ; Kapitel : 12 ; 165-180
2014-11-22
16 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
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