01556279

Component

https://doi.org/10.3141/2498-11

User equilibrium (UE) models are widely used in network flow assignment in transportation engineering. For a given UE solution, the link flow pattern is unique, although the flows of entire routes may have many solutions. On the basis of linear substitution relationships detected between the equilibrated travel routes, this study proposes a new, efficient approach to find a maximum set of independent UE routes, referred to as "the set of basic routes." The basic route set is associated with a basis of the linear space of route flow solutions, which plays an important role in the sensitivity analysis of the UE models. The linear relationships are observed within a specific structure composed of a set of grouped alternative segments (GAS). Certain properties of the GAS structure are derived. A simple process for generating the basic routes is provided by using the features of the GAS. Numerical results on several networks demonstrate that using the GAS structure to find the set of independent UE routes can be efficient.

01575261

15-2669

English

pp 91–98

2015

Transportation Research Record: Journal of the Transportation Research Board

9780309295758

Print

Figures (5) ; References (30) ; Tables (3)

Network links; Network nodes; Origin and destination; Routes; Traffic assignment; Traffic flow; Travel demand

Link flows; Road networks; Route flows; User equilibrium

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

TRIS, TRB, ATRI

Dec 30 2014 12:55PM

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