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This paper uses the cellular automaton model to study the dynamics of traffic flow around an on-ramp with an acceleration lane.It adopts a parameter,which can reflect different lane-changing behaviour,to represent the diversity of driving behaviour.The refined cellular automaton model is used to describe the lower acceleration rate of a vehicle.The phase diagram and the capacity of the on-ramp system are investigated.The simulation results show that in the single cell model,the capacity of the on-ramp system will stay at the highest flow of a one lane system when the driver is moderate and careful;it will be reduced when the driver is aggressive.In the refined cellular automaton model,the capacity is always reduced even when the driver is careful.It proposes that the capacity drop of the on-ramp system is caused by aggressive lane-changing behaviour and lower acceleration rate.
This paper uses the cellular automaton model to study the dynamics of traffic flow around an on-ramp with an acceleration lane. It can be reflect different lane-changing behavior, to represent the diversity of driving behavior. The refined cellular automaton. model is used to describe the lower acceleration rate of a vehicle. phase diagram and the capacity of the on-ramp system are investigated. the simulation results show that in the single cell model, the capacity of the on-ramp system will stay at the highest flow of a one lane system when the driver is moderate and careful; it will be reduced when the driver is aggressive. In the refined cellular automaton model, the capacity is always reduced even when the driver is careful. drop of the on-ramp system is caused by aggressive lane-changing behavior and lower acceleration rate.