A porous flow approach to modeling heterogeneous traffic in disordered systems

A porous flow approach to modeling heterogeneous traffic in disordered systems

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Article ID: iaor201110253
Volume: 45
Issue: 9
Start Page Number: 1331
End Page Number: 1345
Publication Date: Nov 2011
Journal: Transportation Research Part B
Authors: , ,
Keywords: traffic flow
Abstract:

A continuum model that describes a disordered, heterogeneous traffic stream is presented. Such systems are widely prevalent in developing countries where classical traffic models cannot be readily applied. The characteristics of such systems are unique since drivers of smaller vehicles exploit their maneuverability to move ahead through lateral gaps at lower speeds. At higher speeds, larger vehicles press their advantage of greater motive power. The traffic stream at the microscopic level is disordered and defines a porous medium. Each vehicle is considered to move through a series of pores defined by other vehicles. A speed‐density relationship that explicitly considers the pore space distribution is presented. This captures the considerable dynamics between vehicle classes that are overlooked when all classes are converted to a reference class (usually Passenger Car Equivalents) as is traditionally done. Using a finite difference approximation scheme, traffic evolution for a two‐class traffic stream is shown.

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