| Summary: | Traffic congestion has become a severe problem. Numerous studies have focused
on optimising intersection performance under homogeneous traffic flow, which
refers to a situation on a road where vehicle dimensions do not vary much from each
other and vehicles behave similarly in terms of speed and following distance. However,
few studies have considered mixed traffic flow. Mixed traffic flow is exceedingly
stochastic and non-linear, with numerous traffic compositions which limit the largescale
application of previously proposed methods. Hence, the intersection performance
under mixed traffic flow is optimised from two aspects: intersection layout and signal
timing. For intersection layout, this study considers an existing one-lane left-turn bypass
intersection. To improve the intersection performance, an alternative two-lane
left-turn bypass intersection layout is proposed. A simulation study to compare the
proposed intersection with the two other intersection layouts under mixed traffic flow
is conducted. The results show that the proposed intersection outperforms the two
other layouts. For signal timing, this study considers the multi-objective signal timing
optimisation problem for isolated intersection under mixed traffic flow. The findings
demonstrate that traffic signal plans yielded by the proposed method have more advantages
in reducing traffic congestion compared to the existing traffic signal plans. A
main contribution of this study is the consideration of mixed traffic flow by including
two-wheeled vehicles in the model.
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