EXPRESSWAY ROUTE SELECTION AND VEHICULAR USAGE

Abstract

FROM EXPERIENCE GAINED IN CONDUCTING THREE COMPREHENSIVE ORIGIN AND DESTINATION SURVEYS FOR THE STATE HIGHWAY COMMISSION OF INDIANA AND THE SUBSEQUENT PREPARATION OF TRAFFIC SURVEY AND HIGHWAY PLAN REPORTS, A DISCUSSION IS PRESENTED OF THE DEVELOPMENT OF EFFECTIVE METHODS FOR THE SELECTION OF URBAN EXPRESSWAY ROUTES AND THE DETERMINATION OF THEIR PERCENT OF USAGE BY VEHICLES. THE SELECTION OF EXPRESSWAY ROUTES, BECAUSE OF THE INTRICACIES INVOLVED, CANNOT BE EXPRESSED IN MATHEMATICAL TERMS, BUT RATHER MUST CONSIDER THE MAJOR DESIRE LINE GRAPHS AS THE PRIMARY BASIS FOR SELECTION COORDINATED WITH AN INTIMATE KNOWLEDGE OF THE CITY APPLIED TO LAND USE, SANBORN AND CITY MAPS, AERIAL PHOTOGRAPHS AND AN INTENSIVE FIELD RECONNAISSANCE. THE EXTENT TO WHICH VEHICLES WILL USE THE EXPRESSWAY IS SHOWN TO DEPEND ON THE EXPRESSWAY DISTANCE (THE LENGTH OF THE EXPRESSWAY PORTION OF THE TRIP), THE ACCESS DISTANCE (THE LENGTH OF CITY STREETS USED TO ENTER AND LEAVE THE EXPRESSWAY IN CONNECTION WITH A TRIP), AND THE ADVERSE DISTANCE (THE INCREASED DISTANCE REQUIRED FOR THE TRIP VIA THE EXPRESSWAY AS COMPARED TO A MORE DIRECT ROUTE USING THE CITY STREETS. SPEEDS ON THE EXPRESSWAY WERE ASSUMED AS TWICE THOSE ON CITY STREETS. FROM THESE CONCEPTIONS AN EXPRESSION WAS OBTAINED TO PROVIDE A RATIONAL METHOD FOR COMPUTING THE ACTUAL PERCENT USAGE OF EXPRESSWAY. LABORIOUS CALCULATIONS INVOLVED IN THE APPLICATION OF THE FORMULA ARE ELIMINATED BY THE USE OF A GRAPH OR MECHANICAL DEVICE DEVELOPED IN CONNECTION WITH THE STUDY. /AUTHOR/

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