Influence analysis of road reflective characteristic on roadway luminary design

The influence of road reflective characteristic to the uniformity of illuminance and uniformity of luminance are discussed for roadway lighting on cement concrete road and asphalt road. The luminous intensity function designed with illuminance uniformity purpose can fulfill the lighting requirements for cement concrete road. But in asphalt road case, it leads to enormous fluctuate of luminance. Luminous intensity function based on luminance uniformity design will be feasible for cement concrete road. But it will cause poor illuminance uniformity on asphalt road due to the specular reflection.