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1991 Proceedings, Institute of Transportaiton Engineers. This paper demonstrates that the Manual on Uniform Traffic Control Devices (MUTCD) because of its ambiguity,ambivalence, ambage adds confusion to legal issues and, therefore, cloud the judgement on what is safe traffic control practice. 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