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Texas Transportation Institute, Research Report 134-5, May 1971. This research used following vehicle photography to examine the precise paths of vehicles traveling through horizontal highway curve in order to test the design AASHO design assumption that vehicles exactly follow the designed path. The study found a definitive variance between the traveled and designed paths. Photocopy. Book, expert 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