Determining Pavement Reflectivity for Road Lighting Design

摘要

This study reviews existing research and methodology used in pavement reflectance classification systems. The reflectance characteristics of roadway surfaces affect the quantity of light reflected from the roadway at night towards the driver. The variability of reflectance has an impact on the uniformity of luminance of a pavement surface. Uniformity in turn affects driver visibility at night on roadways utilizing fixed lighting systems. This report documents a study which sought to develop new methodology and instrumentation for a pavement reflectance classification system used for roadway luminance calculations. Reflectance characteristics and micro/macro-texture of in situ pavements were measured at five different test sites in the State of Colorado. Instrumentation and methodology that was used to measure the hemispherical reflectance data is described in the report. Sand Patch and British Portable Tester are used to investigate changes in the micro/macro-structure of the pavement as a function of time and wear.