1991•Transportation Research Record Journal of the Transportation Research BoardRequires access

FACTORS AFFECTING MAXIMUM GRADEABILITY OF A LOG TRUCK AROUND A CURVE

Paul Anderson, John Sessions

Abstract

Steep road grades provide managers with a way to reduce the economic and environmental costs of transportation systems. Available formulas for calculating log truck gradeability do not consider the performance of log trucks on horizontal curves. The maximum grade that a log truck can climb on a circular curve is less than that on a tangent for a number of reasons. These factors are discussed and some preliminary results obtained from a mathematical model are presented. Predictions from the mathematical model are compared with field observations collected from a survey of steep road operations from forest road managers throughout the USDA Forest Service.

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Key concepts: Truck, Climb, Transport engineering, Tangent, Mathematical model, Field survey, Environmental science, Statistics