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THE EVOLUTION OP TRAFFIC REGULATION
TRAFFIC OFFICER CONTROL AT INTERSECTIONS
AUTOMATIC TRAFFIC CONTROL SIGNALS
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accident actuated alternate system American City angle Automatic Signal Corporation average speed cars cent Central Business District colors Conference on Street coordination cross street cross traffic cycle length delay detector Detroit diagram direction distance drivers electrically entering the intersection equation feet Figure fixed-time control flexible progressive system green light groups horizontal indications installation Knight Dunlap L-Turns lane left-turning vehicles lens lenses master control maximum interval method miles per hour motor vehicle movement of traffic Nachod National Safety Council number of vehicles operated parabolic reflector police red light seconds semaphore signal lights signal system simultaneous system Street and Highway Street Traffic Signs synchronous tion towers traf Traffic Code traffic control signals Traffic Engineers traffic flow traffic movement traffic officer Traffic Regulation traffic signals traffic-actuated control trians turning vehicles two-color vehicles passing vehicular traffic volume of traffic William Phelps Eno yellow