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A Lagrange representation of cellular automaton traffic-flow models

Katsuhiro Nishinari

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A new cellular automaton (CA) model of traffic flow in the Lagrange form is proposed in this paper. We study the algebraic relationship between models with the Lagrange form and the Euler form of Burger's CA, which is constructed from Burger's equation using the ultradiscrete method. It is found that the Lagrange form has made the description of traffic flow in one lane simpler. Thus we have extended a simple Lagrange model to include the effects of inertia of cars and drivers' perspective. The extended model shows metastable states and complex phase transition from a free to congested state, which is similar to the observed data for expressways.


PACS

45.70.Vn Granular models of complex systems; traffic flow

05.90.+m Other topics in statistical physics, thermodynamics, and nonlinear dynamical systems (restricted to new topics in section 05)

MSC

35Q53 KdV-like equations (Korteweg-de Vries, Burgers, sine-Gordon, sinh-Gordon, etc.) (See also 37K10)

60K30 Applications (congestion, allocation, storage, traffic, etc.) (See also 90Bxx)

82B26 Phase transitions (general)

68Q80 Cellular automata (See also 37B15)

37B15 Cellular automata

Subjects

Statistical physics and nonlinear systems

Dates

Issue 48 (7 December 2001)

Received 2 April 2001, in final form 25 July 2001

Published 23 November 2001



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