Review of Truck Characteristics as Factors in Roadway Design (2003) / Chapter Skim
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Pages 160-165
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From page 160... ...
E-1 APPENDIX E TRUCK SPEED PROFILE MODEL A truck speed profile model (TSPM) for truck performance on upgrades has been developed as a design tool to permit highway agencies to anticipate when an added climbing lane may be warranted.
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The speed profile spreadsheet includes the minimum and maximum truck speeds computed by the spreadsheet and their difference. If the maximum speed represents the truck speed in advance of the upgrade, then the difference between the maximum and minimum speeds represents the speed reduction on the grade.
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E-3 TRUCK SPEED PROFILE FOR ROUTE 3 Desired speed (mph) = 65.0 Maximum speed (mph)
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E-4 TRUCK SPEED PROFILE FOR ROUTE 3 Desired speed (mph) = 65.0 Maximum speed (mph)
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V′ = larger of speed at beginning of interval (V) and 10 ft/s Cde = correction factor for converting sea-level aerodynamic drag to local elevation = (1 − 0.000006887E)
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From page 165... ...
based on maximum preferred accelerations (or decelerations) for drivers for three specific cases: If |Vd − V| ≤ 1.2 then, Vn = Vd (5)
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