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activities additional adopted attend Board of Education car safety zones city departments city of Detroit collisions committee Common Council compulsory inspection coordinating agency cost crossing gates crossing protection determine driver's license effective efficiency electric Evanston experimental extensive flow of traffic furnish gates grade crossing grade separations Grand Boulevard Grand River Grand Trunk Railway Gratiot hazard Highway Department illuminated improvement inaugurated installed large number License School ment Michigan miles Milwaukee Motors Corporation movement of traffic necessary night driving number of accidents one-way streets operation Parking meters parochial schools partments pedestrian Pickert Police Department police officers possible precinct present problem Railroad grade railway Rear-end collisions recommended reduction of traffic responsibility Safety Commission secondary arterial highways session signal head Street car safety street lighting street pattern superhighways system of secondary tion traf traffic accident prevention traffic court Traffic Survey Bureau transportation system types of accidents Warren widening