Traffic Assignment Models In Road Evacuation
Author(s)
M. Luisa De Maio, G. Musolino & A. Vitetta
Abstract
In this paper a traffic assignment model is specified in road emergency
conditions. The proposed model takes into account two classes of users: some
users in emergency conditions repeat the same choice made in ordinary
conditions, some others make a different choice. The basic concept for the
proposed model is derived from day-to-day models. The path choice model,
which is inside the traffic assignment model, has to take into account three types
of information which influence users’ choices: historical information related to
network experience in ordinary conditions, real time information related to the
current emergency situation, and users’ forecasting of the network evolution
based on current experience. A non-equilibrium dynamic model is adopted in
order to simulate path flows on the network. A review of static and dynamic
traffic assignment models in emergency conditions is reported.
Keywords: traffic assignment, dynamic traffic assignment, dynamic equilibrium,
day-to-day models, non-equilibrium models.
1 Introduction
A traffic assignment (TA) model simulates how travel demand and transport
networks interact in transportation systems. These models allow the calculation
of performances (costs) and vehicular flows on each element (link) of the
transport network, resulting from origin–destination demand flows, users’ path
choice behaviour and link costs.
TA models may be classified according to different criteria. The first one
concerns the dependence of link cost variables on vehicular flows. Fixed costs or
uncongested networks result in non-equilibrium traffic assignment models.
Variable costs or congested networks lead to equilibrium traffic assignment
Keywords
traffic assignment, dynamic traffic assignment, dynamic equilibrium,
day-to-day models, non-equilibrium models.
Related Book
Other papers in this volume
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