01020299

Component

The behaviour of traffic phenomena is described through three types of approaches. The first approach is macroscopic, based on the analogy with fluid mechanics through three basic variables: the flow rate q, the density p and the speed v. The second approach is microscopic, enabling one to point out the interaction phenomena between vehicles, through the vehicle speed v, the position x and the acceleration y. The third approach, which is the hybrid approach, is less known in the traffic domain. It makes it possible to combine the macroscopic and microscopic approaches. This paper proposes a hybrid model, based on a second order macroscopic modelling principle. As a first step, the models to be coupled will be chosen, and the analytical solution of the second order macroscopic model will be carried out. This model will be reformulated under the form of a supply and demand function, similar to the model by Lighthill-Witham-Richards. More precisely, two scenarios will be studied: first a hybrid model in the case of traffic at equilibrium, which will enable us to do a comparative study with an existing hybrid model in the literature. As a second step, the transition from a macroscopic representation of traffic to a microscopic representation in the conditions of an out of equilibrium traffic will be studied. The validation of the proper transmission of information from one traffic vision to another will be done, studying the propagation of congestion from upstream to downstream.

01020180

06-2160

English

23p

2006

Transportation Research Board 85th Annual Meeting

CD-ROM

Figures (6) ; References (23)

Acceleration (Mechanics); Equations; Highway traffic; Macroscopic traffic flow; Microscopic traffic flow; Traffic congestion; Traffic data; Traffic density; Traffic models; Traffic speed

Downstream traffic data; Hybrid models; Macroscopic models; Position

Highways; Operations and Traffic Management; I71: Traffic Theory

Transportation Research Board Annual Meeting 2006 Paper #06-2160

TRIS, TRB

Mar 3 2006 10:54AM