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area of influence basic cation classification analysis classification group classification of places classification of roads classification process classification study classifying roads computations criteria degree of traffic destination economic and social economic data economic factors established frequencies of trips frequency-distance function Grand Rapids higher classification Highways used predominantly immediate retail trade increments individual curves LINES OF CLASS METHOD OF RURAL Metropolitan Centers MICHIGAN STATE HIGHWAY newspaper circulation operations and resources pattern percent place classification place of origin places in Classes Planning and Traffic population predominantly for traffic principally connect regional relative importance retail trade area road use data roads connected routine interest trips RURAL ROAD CLASSIFICATION SAULT STE MARIE secondary roads selecting and classifying SERVING DESIRE LINES special interest trips state-wide importance state-wide traffic attraction state's total rural traffic attraction characteristics traffic attraction curves Traffic Division traffic movement traffic significance trip data trip frequencies UNIVERSITY OF MICHIGAN vhich