The car-following model of traffic is extended to mimic bus behavior in the
bus route. We study the phase transitions and bunching in the bus route mo
del by both simulation and linear stability analysis. It is found that the
jamming transitions among an inhomogeneous bunching phase, the homogeneous
free traffic, the coexisting phase, and the homogeneous congested traffic p
hase occur with increasing density. It is shown that the transition lines o
btained from simulation are consistent with those from the linear stability
analysis. (C) 2000 Elsevier Science B.V. All rights reserved.