Unsealed Road Deterioration

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Presentation transcript:

Unsealed Road Deterioration Christopher R. Bennett Director - Data Collection Ltd. The World Bank

Roughness and Gravel Thickness Roughness Function of: - Daily Traffic - Grading Frequency - Material Properties - Rainfall - Rise & Fall and Curvature Maximum Roughness Minimum Roughness Gravel Function of: - Daily Traffic - Material Properties - Rainfall - Rise & Fall and Curvature

Minimum and Maximum Roughness 100 ADT 365 Days Gradings 1095 Days Gradings 10 ADT 365 Days Gradings 100 ADT 30 Days Gradings 400 ADT

Rural Transport Infrastructure Notes RT1 - Typical Unpaved Roads: Roughness Predicted by the HDM-III Model RT2 - Unpaved Roads: Roughness Estimation by Subjective Evaluation RT3 - Paving of Unpaved Roads: Economically Justified Paving Costs http://www.worldbank.org/html/fpd/transport/publicat/tdinflst.htm#rural

DETOUR Model The Deterioration of Unpaved Roads Model (DETOUR) implements in MS-Excel the road deterioration relationships for unpaved roads of the Highway Development and Management Model (HDM-4) and is designed primarily for engineered unpaved roads, of either gravel or earth surfacing. http://www.worldbank.org/html/fpd/transport/roads/tools.htm#rttools

RED Model The Roads Economic Decision Model (RED ) is a customized MS-Excel model for the economic evaluation of low volume roads. http://www.worldbank.org/html/fpd/transport/roads/tools.htm#rttools

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