ESTIMATION OF THE BPR PARAMETERS FOR EQUILIBRIUM ASSIGNMENT

Abstract

In Japan, there are few studies about the estimation of BPR type link cost function used for equilibrium assignment. These are many observation errors in the road traffic census data, which are used for the estimation of BPR function, and the errors are hard to treat. In this paper, the present condition of the stop time and travel speed by road traffic census data is examined, and the method of lessening observation errors is proposed. The parameter estimation of BPR type link cost function, which took the influence of a signal crossing into consideration separately, is tried. Furthermore, time of day user equilibrium assignment by the OD correcting method is carried out using estimated function, and it confirmed the applicability of BPR function to be proposed.