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原文传递 Implementation Guide for Minimum Retroreflectivity Requirements for Traffic Signs; Final rept. Sep 93-Oct 96

题名：	Implementation Guide for Minimum Retroreflectivity Requirements for Traffic Signs; Final rept. Sep 93-Oct 96
作者：	McGee, H. W.; Paniati, J. A.
关键词：	Traffic signs; Sign reflectance; Guidelines; Requirements; Cost effectiveness; Reflectorized signs; Sign maintenance; Sign legibility; Luminance
摘要：	The FHWA embarked on a comprehensive research program which resulted in recommended guidelines for minimum retroreflectivity values for four types of signs: yellow or orange warning signs, white on red regulatory signs, white regulatory signs, and white on green guide signs. The retroreflectivity value developed for each group of signs are considered the retroreflectivity levels below which the sign would be inadequate for meeting the nightime visibility requirements for most drivers, and therefore, should be programmed for replacement. To assist agencies in developing a cost-effective program for timely replacement of ineffective signs, this document was prepared. Initially the report describes the principles of retroreflectivity, the types of retroreflective materials, and the proposed minimum retroreflectivity guidelines. Then, the report presents the concept of a sign management system, and provides guidance for developing a sign inventory, conducting sign inspections, and maintaining signs. The report concludes with discussing options that State and local agencies can follow for replacing their ineffective signs and offers a minimum and desirable program.
总页数：	64p
报告类型：	科技报告