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15-Minute Counter 24-hour count Allen County Annual Average average weekday battery clamp Cldy clock and printer continuous count stations counts are taken counts taken county arterial County Commissioner county highway department county road officials county seat coverage count stations cyclic variations Daily Traffic Detailed View diaphragm dial estimate of AADT extension and research Figure Grayslake HERPIC hose Hose Clamp Indiana County Indiana State Highway ISHC lane lock-nut on clock-hand LOW VOLUME machine counts magnetic counter manual counts monthly count station monthly factors near-side operation paper tape pavement Permanent Traffic Recorder personnel POTENTIOMETER print motor print wheels printer assembly procedure provide county Purdue University road improvement Roadtube Anchored Rush County short counts Streeter Amet manual synchronized tions traffic count data traffic count program Traffic Counting Stations Traffic Recorder Data Traffic Recorders Located traffic volume transistor module travel characteristics Travel on County tube types of traffic Typewheels vehicles