Deduction of Link Performance Function and Its Regression Analysis

Zhenbo Lu

23 citations0/0 files storedJournal of Highway and Transportation Research and Development

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Transportation Planning and Optimization Traffic control and management Traffic Prediction and Management Techniques

Abstract

Link Performance Function is a key factor to traffic assignment,and BPR function is one widely used,but the result is not satisfying when BPR function is used in some cases with its default parameter alfa and belta which are recommended by U.S Bureau of Public Roads.The paper deducted the relationship between link flow and travel time on link and gave an equation to express it.Comparing the equation with BPR function,it was found that there existed great difference between them.In order to find a function to replace the BPR function,an exponent parabolic regression equation is presented by regression method.In addition,the alfa and belta parameters of BPR funcition are gotten by means of regression method.

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