关键词: 城市交通, 混合交通流, 元胞自动机；公交停靠站；信号交叉口

Abstract:

In the real road traffic system, local congestion always occurs near the intersections or bus stops, which have become the main bottlenecks of urban traffic development. Considering the scenario with signalized intersection and a nearby bus stop, this paper investigates the lanechanging and dwelling behaviors in a twolane mixed traffic and conducted the simulation using a cellular automaton model under open boundary condition. Simulation results show that for different proportions of bus flow over the whole flow, a critical probability sending vehicles into the system exists and represents the decreasing trend with respect to the bus flow proportion. Within the critical value, traffic is always the free flow and the flow increases with the probability; whereas, beyond the critical value, the traffic will be saturated. The paper proposes that during rush hours, the queuing upstream the intersection can stretch to the bus stop and then disturb the normal dwelling operation of buses. Therefore, it is necessary to reasonably design the position of signalized intersection and the corresponding cycle time.

Key words: urban traffic, mixed traffic flow, cellular automaton, bus stop, signalized intersection