Analysis of Truck Use and Highway Cost Allocation in Texas
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1985-06-01
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Edition:Interim - September, 1982 - June, 1985
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Abstract:The highway cost allocation problem is one of determining equitable charges for each of the vehicle classes sharing transportation facilities such as highways and bridges. Previous attempts at solving this problem can essentially be reduced to two major approaches: (a) proportional allocation methods, which determine costs in proportion to one or more measures of highway usage; and (b) incremental methods, which allocate costs on the basis of highway design differences necessary to accommodate gradually heavier vehicle classes. This report develops two new highway cost allocation methodologies that actually extend the basic concepts of the incremental and proportional allocation procedures. The new methods are referred to as the "Modified Incremental Approach" and the "Generalized Method." Both methods fulfill the following conditions: (a) highway costs are completely financed by users (completeness condition); (b) vehicle classes reduce their cost responsibilities by sharing the facilities with other vehicle classes (rationality principle); and (c) vehicle classes are charged at least enough to cover their corresponding marginal costs (marginality principle). An example using Texas pavement data is utilized to illustrate the application of the proposed methods.
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