United States Department of Transportation
i
Automating the Implementation of the Updated Grade Severity Rating System (GSRS) for Wyoming Mountain Passes [Research Brief]
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2023-03-01
[PDF-315.63 KB]
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Abstract:Researchers validated the Grade Severity Rating System (GSRS) model for trucks that have only drum brakes installed, incorporated horizontal curves into the formulation of weight-specific speed (WSS) signs, and developed a program that automates the GSRS implementation. The GSRS validation was achieved by conducting field tests, specifically, the hill descent and validation tests with a fully loaded truck fitted with only drum brakes. In this study, the GSRS model was updated, and the updated mathematical model was automated through an interactive, intuitive, aesthetically appealing, and user-friendly objected-oriented Visual Basic.net software. Additional research on the GSRS model was accomplished to account for large truck vehicle stability, specifically, rollovers and skidding/side slip during grade descent. These scenarios become relevant in the presence of horizontal curves. To factor in the influence of horizontal curves on the maximum safe speed of truck descent with respect to vehicle stability—rollover and skidding to be specific—simulations were run on TruckSim® 2020 for a variety of rollover margins, superelevations, truck weights, deflection angles of the horizontal curves, longitudinal grades, speeds, and radii of curvature of the horizontal curve.
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