Sufficient Loading Conditions for Self-organization in the $n$-dimensional Version of BML Model with Stochastic Direction Choice

TL;DR

This paper analyzes an n-dimensional stochastic BML traffic model, establishing conditions for self-organization into free movement states using Buslaev net theory, with implications for understanding traffic flow and particle dynamics.

Contribution

It introduces a novel application of Buslaev net analysis to the stochastic n-dimensional BML model and derives a sufficient condition for self-organization into free movement states.

Findings

Self-organization condition based on particle count and lattice dimensions.

Equivalence of the BML model to a Buslaev net allows new analytical approaches.

Identifies the impact of stochastic particle type changes on system dynamics.

Abstract

A dynamical system is considered, which comprises an $n$-dimensional lattice $N_1 \times N_2 \times \dots \times N_n$ with periodic boundary conditions. Particles traverse this lattice following a variant of the Biham--Middleton--Levine (BML) traffic model's particle movement rules. We have proved that the BML model, when treated as a dynamical system, constitutes a specialized class of a Buslaev net. This equivalence allows us to employ established Buslaev net analysis techniques to investigate the BML model. In Buslaev nets conception the self-organization property of the system corresponds to the existance of velocity single point spectrum equal to 1. One notable aspect of the model under consideration is that particles can change their type with a certain probability. For simplicity, we assume a constant probability $q$ that a particle changes type at each step. In the l case where $q=0$, the system corresponds to the classical version of the BML model. We define a state of the system where all particles continue to move indefinitely, both in the present and the future, as a state of free movement. A sufficient condition for the system to result in a state of free movement from any initial state (condition for self-organization) has been found. This condition is that the number of particles be not greater than half the greatest common divisor of the numbers $N_1$ $N_2,\dots,N_n.$