Calibrating Combined Model of Trip Distribution, Modal Split, and Traffic Assignment

1997 ◽  
Vol 1607 (1) ◽  
pp. 1-5 ◽  
Author(s):  
David E. Boyce ◽  
Yu-Fang Zhang
Keyword(s):  
Traffic Assignment ◽  
Calibration Method ◽  
Operational Method ◽  
Combined Model ◽  
Trip Distribution ◽  
Modal Split ◽  
Travel Forecasting

A method for calibrating a combined model of travel choices for the Chicago, Illinois, region is described and illustrated. This model and its simultaneous calibration method seek to ensure that travel choices are represented consistently, thereby offering an operational method for implementing and solving the four-step travel forecasting procedure with feedback.

scholarly journals A Two-Phase Gradient Projection Algorithm for Solving the Combined Modal Split and Traffic Assignment Problem with Nested Logit Function

2021 ◽  
Vol 2021 ◽  
pp. 1-18
Author(s):  
Seungkyu Ryu ◽  
Anthony Chen ◽  
Songyot Kitthamkesorn
Keyword(s):  
Large Scale ◽  
Traffic Assignment ◽  
Transportation Network ◽  
User Equilibrium ◽  
Gradient Projection ◽  
Projection Algorithm ◽  
Nested Logit ◽  
Two Phase ◽  
Phase Gradient ◽  
Modal Split

This study provides a gradient projection (GP) algorithm to solve the combined modal split and traffic assignment (CMSTA) problem. The nested logit (NL) model is used to consider the mode correlation under the user equilibrium (UE) route choice condition. Specifically, a two-phase GP algorithm is developed to handle the hierarchical structure of the NL model in the CMSTA problem. The Seoul transportation network in Korea is adopted to demonstrate an applicability in a large-scale multimodal transportation network. The results show that the proposed GP solution algorithm outperforms the method of the successive averages (MSA) algorithm and the classical Evan’s algorithm.

Quasi-Dynamic Urban-Location Models with Endogenously Determined Travel Costs

1979 ◽  
Vol 11 (5) ◽  
pp. 575-584 ◽  
Author(s):  
D E Boyce ◽  
F Southworth
Keyword(s):  
Dynamic Model ◽  
Combined Model ◽  
Trip Distribution ◽  
Travel Costs ◽  
Urban Location ◽  
Location Models ◽  
Assignment Model ◽  
Job Location

A quasi-dynamic model of residential and job location is fused with the equilibrium trip-assignment model in the manner suggested by the combined model of trip distribution and assignment. The implications of this combined model for assumptions about future levels of interaction are examined. Extensions of the model to include explicit housing stocks and prices and the determination of residential- and job-location attractiveness are considered.

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