This product will provide a truck speed profile model (TSPM) for truck performance on upgrades which has been developed as a design tool to permit highway agencies to anticipate when an added climbing lane may be warranted. TSPM is implemented in a Microsoft Excel spreadsheet. This appendix illustrates how the speed profile model operates and documents the truck performance equations that form the basis for that model. The current Green Book contains several truck speed profile plots (i.e., plots of truck speed vs. distance along a grade) for use in determining the critical length of grade that might warrant a climbing lane. These plots are not as useful as they might be since they assume a single initial truck speed, a constant percent grade, and a single truck weight-to-power ratio (120 kg/kW (200 lb/hp)). The TSPM spreadsheet allows the user to input the actual vertical alignment for any site of interest and to choose any appropriate value for initial truck speed and weight-to-power ratio. This flexibility should improve the ability of highway agencies to determine whether the climbing lane criteria are met at any particular site.


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    Title :

    Review of Truck Characteristics as Factors in Roadway Design (on diskette)


    Publication date :

    2003


    Size :

    pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English




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