01478028

Component

A closed-form logit-style formulation basing on route impedance correction is proposed to alleviate defeats caused by the independence of irrelevant alternatives (IIA) and the homoscedasticity properties of multinomial logit (MNL) route choice model. The algorithm utilizes the traditional correction method to add addition impedance to each route by route pair combination with improved correction algorithm. For each route pair, a binary logit model with the concept of Logit Equivalent Impedance is utilized to calculate the route impedance correction, which is derived from two assumptions: (1) the route choice probabilities are independent of the overlapping part so that IIA property can be alleviated; and (2) the variances of route impedances are proportional to route impedances to resolve the homoscedasticity issue. The closed-form structure and easy computation of original MNL model remain unchanged. Numerical examples show that the proposed approach produces more reasonable results than traditional models with same complexity of computation, and is more stable when the number of routes in reasonable route choice set changes.

This paper was sponsored by TRB committee ADB40 Transportation Demand Forecasting.

01470560

13-2486

English

13p

2013

Transportation Research Board 92nd Annual Meeting

Digital/other

Figures; References; Tables

Algorithms; Multinomial logits; Numerical analysis; Route choice; Traffic models

Computational models

Highways; Planning and Forecasting; I72: Traffic and Transport Planning

Transportation Research Board Annual Meeting 2013 Paper #13-2486

TRIS, TRB, ATRI

Feb 5 2013 12:32PM