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Title: Origin-destination matrix estimation for pedestrian networks with Bi-directional flow effects
Authors: Chan, KS
Lam, WHK 
Issue Date: 2006
Source: Proceedings of the 11th International Conference of Hong Kong Society for Transportation Studies: Sustainable Transportation, 2006, p. 259-268 How to cite?
Abstract: This paper deals with the problem of origin-destination (O-D) matrix estimation from pedestrian counts. This problem is formulated as a bi-level programming problem. The lower-level problem is the user equilibrium (UE) assignment problem for pedestrian networks with bi-directional flow effects, while the upper-level problem is to estimate the O-D demands from pedestrian counts. To accommodate the effects of bi-directional pedestrian flows at various flow conditions, the walking time function with generalized bi-directional pedestrian-flow ratio (GBPR) is calibrated using data observed at an outdoor walkway in Hong Kong. The lower-level problem incorporates this GBPR function to take account of the bi-directional flow effects and is able to provide more realistic estimation of pedestrian network flows. Two solution algorithms are adapted for solving the proposed bi-level programming problem. A numerical example is provided to illustrate the applications of the proposed model and of the two developed solution algorithms. Algorithm 2 (diagonalization method with Newton method) can give solution with the lowest upper-level objective value than the Algorithm 1 (diagonalization method with method of successive average). The O-D estimation error will increase if the bi-directional flow effects were not taken into account in the O-D estimation process.
Description: 11th International Conference of Hong Kong Society for Transportation Studies: Sustainable Transportation, Kowloon, 9-11 December 2006
ISBN: 9889884704
Appears in Collections:Conference Paper

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