EFFECTS OF VARYING POLICIES AND ASSUMPTIONS ON NATIONAL HIGHWAY REQUIREMENTS

Abstract

THIS PAPER PRESENTS THE RESULTS OF AN ANALYTICAL POLICY PLANNING STUDY IN WHICH COMPUTERIZED MODELING TECHNIQUES WERE DEVELOPED TO EXAMINE THE EFFECTS OF VARYING POLICIES AND ASSUMPTIONS ON THE NATIONAL HIGHWAY PROGRAM. THE TECHNIQUES ARE AGGREGATE MODELS IN THAT THEY DEAL WITH LARGE GEOGRAPHIC AREAS AS THE UNIT OF ANALYSIS. THEY ARE CAPABLE OF DEALING WITH A WIDE VARIETY OF ALTERNATIVES RANGING FROM BUILDING NO ADDITIONAL HIGHWAYS TO EXTENSIVELY BUILDING HIGHWAYS. IN ADDITION, THE MODELS ARE CAPABLE OF INDICATING THE MIX AMONG HIGHWAY FACILITY TYPES BASED ON TRADE-OFFS BETWEEN INVESTMENTS AND BENEFITS BOTH DIRECT AND EXTERNAL. THE PAPER PRESENTS THE RESULTS OF THIS STUDY IN TERMS OF ANALYSES OF A BASE ECONOMIC OPTIMUM AND MAINTENANCE OF THE CURRENT LEVEL-OF-SERVICE ALTERNATIVES, THE TRANSPORTATION IMPLICATIONS OF ALTERNATIVE NATIONAL POPULATION DISTRIBUTIONS, THE IMPACT OF CHANGES IN HIGHWAY TRAVEL DEMAND AND MODAL SPLIT, THE EFFECTS OF VARYING ECONOMIC ASSUMPTIONS ON HIGHWAY REQUIREMENTS, AND THE IMPLICATIONS OF INCREASED EMPHASIS ON HIGHWAY IMPACTS.

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