Experimental Investigation of Pavement Light Reflection Characteristics in Wet Conditions

Abstract

Road lighting effects on traffic accidents and varies with pavement materials and weather conditions. In conditions of wet, poor uniformities and glare due to high specular reflection have been found and negatively effect on visual performance of drivers. To improve light quality, the adaptive roadway luminaire which has multi light distributions which are suitable for dry and wet road surfaces is proposed. However, wet conditions is very complicated because of its dynamic characteristics. The pavement light reflection properties in wet conditions were studied in this paper. Three various materials and aging having concrete, rough asphalt and fine asphalt were extracted to do the experiments in the laboratory by using the modified gonioreflectometer. The results showed the different of dynamically changing of specular factor (S1) and the major r-values of various pavement materials in wet conditions. They can be divided into three stages. Moreover, changing of the reflected light colour are disappeared over wet surfaces.

Exploring the effect of pavement reflection and photometric properties on road lighting performance

“…17,18 Researchers in the field of lighting engineering have explored the possibility of applying adaptive smart luminaires as the smart lights design system to promote a better lighting environment. 19,20 However, the reflection property of pavement varies dynamically owing to the different materials on pavement, its usage periods and physical states such as dry and wet. 21 In the field of road and pavement engineering, the connection between pavement reflection properties to lighting and visual safety needs more investigation.…”