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National Cooperative Highway Research Program Report 214, 1979. This highly acclaimed landmark study suggests guidelines, based on aseries of functional analyses relating safety preformance to specific design and operational elements applicable to low-traffic volume rural roads. Photocopy. Book , books,pavement edge drop expert, pavement edge drop off expert, work zone safety expert, construction zone safety expert, roadway hydroplaning expert, traffic engineering expert, traffic sign expert, traffic signal expert, pavement marking expert, highway safety expert