Eur. Phys. J. B 57, 103-108 (2007)
https://doi.org/10.1140/epjb/e2007-00155-x

A modified NaSch model with density-dependent randomization for traffic flow

¹ Shanghai Institute of Applied Mathematics and Mechanics, Shanghai University, Shanghai, 200072, P.R. China
² Faculty of Architectural, Civil Engineering and Environment, Ningbo University, Ningbo, 315211, P.R. China
³ Faculty of science, Ningbo University, Ningbo, 315211, P.R. China

Corresponding author: ^a sqdai@shu.edu.cn

Received: 2 October 2006
Revised: 9 February 2007
Published online: 1 June 2007

Abstract

Based on the Nagel-Schreckenberg (NaSch) model of traffic flow, a modified cellular automaton (CA) traffic model with the density-dependent randomization (abbreviated as the DDR model) is proposed to simulate traffic flow. The fundamental diagram obtained by simulation shows the ability of this modified NaSch model to capture the essential features of traffic flow, e.g., synchronized flow, metastable state, hysteresis and phase separation at higher densities. Comparisons are made between this DDR model and the NaSch model, also between this DDR model and the VDR model. And the underlying mechanism is analyzed. All these results indicate that the presented model is reasonable and more realistic.