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Texas Transportation Institute, Research Report 134-7, July 1971. This study photographed the paths of vehicles performing passing manuevers in highway passing zones. The frictional demands form one basis for determining minimum skid resistance requirements on two-lane rural highways. 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