A modified NaSch model with density-dependent randomization for traffic flow H. B. Zhu, H. X. Ge, L. Y. Dong and S. Q. Dai Eur. Phys. J. B, 57 1 (2007) 103-108 Published online: 01 June 2007 DOI: 10.1140/epjb/e2007-00155-x