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While driving his motor vehicle, the driver constantly looks at the lane marking to help with his or her coursing. The conspicuity of lane markings depends greatly on its retroreflection and that of the surrounding road surface area. In this study, we measured in a darkroom the retroreflection performances of two types of pavement surfaces and also two types of lane marking, all of which are types currently in practical use. The following conclusions were reached as a result: 1. The reflection characteristics of lane marking Compared to conventional type lane marking, high-luminance type lane marking exhibits a reflection characteristic that is approximately 3 and 5 times greater under dry and wet road conditions, respectively. 2. The reflection characteristics of road surfaces From the initial time of paving, the luminance factor of a dense asphalt road surface rises roughly 5-to 6-folds with the passage of time. Thus, the whiteness of road surfaces increases with time.