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Prepared for the U.S. Congress in 1985. Provides critical reviews of nine key prior research documents. Also recommends guidelines on tolerability of pavement edge drop-offs as a function of highway speed and drop-off height and shape. Photocopy Book, books, expert, pavement, edge, drop, offbooks,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