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Characteristics and Needs for Overhead Guide Sign Illumination from Vehicular Headlamps

Eugene Russell

出版	Federal Highway Administration, 1999
URL	http://books.google.com.hk/books?id=KnQsAQAAMAAJ&hl=&source=gbs_api

註釋

A team of Kansas State University researchers was given a contract to determine the minimum luminance requirements for overhead guide signs and to determine if the illuminance from vehicle headlamps on highways was sufficient to provide drivers with this required minimum luminance. This report covers a literature review to determine the minimum luminance value needed, an overview of the equipment developed for field studies of vehicle headlamp illuminance, results of a small laboratory study to determine minimum luminance of highway guide signs, and the results of field studies to determine illuminance values from a sample of the fleet of vehicles on highways, and the results of a study of illuminance values obtained from the headlamps of 50 known vehicles of varying ages and types.