Abstract
Modern trams are developing fast because of their characteristics like medium capability and energy saving. Exclusive way is always set in practice to avoid interruption from general vehicles, while trams have to stop at intersections frequently due to signal rules in the road network. Therefore, signal optimization has great effects on operational efficiency of trams system. In this paper, an arterial signal coordination optimization model is proposed for trams progression based on the Asymmetrical Multi-BAND (AM-BAND) method. The AM-BAND is modified from the following aspects. Firstly, BAM-BAND is developed by supplementing active bandwidth constraints to AM-BAND. Assisted by the IBM ILOG CPLEX Optimization Studio, two arterial signals plans with eight intersections are achieved from AM-BAND and BAM-BAND for comparison. Secondly, based on the modified BAM-BAND, a BAM-TRAMBAND model is presented, which incorporates three constraints regarding tram operations, including dwell time at stations, active signal priority, and minimum bandwidth value. The case study and VISSIM simulation results show that travel times of trams decrease with signal plan from BAM-TRAMBAND comparing with the original signal plan. Moreover, traffic performance indicators such as stops and delay are improved significantly.
Highlights
Modern trams are medium capability urban public transit and develop fast in recent years of China for its characteristics of energy efficiency, environmental friendliness, and passenger comfort
MAXBAND is designed for solving arterial signal coordination for general vehicles, but it is not entirely suitable for public transits because there is no time for stopping at stations in the bandwidth
Based on the literatures review above, an arterial signal coordination optimization model for trams is proposed by modifying AM-BAND in the following aspects: (i) Active bandwidth: incorporate active bandwidth constraints
Summary
Modern trams are medium capability urban public transit and develop fast in recent years of China for its characteristics of energy efficiency, environmental friendliness, and passenger comfort. MAXBAND is designed for solving arterial signal coordination for general vehicles, but it is not entirely suitable for public transits because there is no time for stopping at stations in the bandwidth. Most signal coordination methods for public transits are developed on the basis of MAXBAND, and they introduce constraints on stops at stations. These methods are clearly based on passive priority strategy. Based on the literatures review above, an arterial signal coordination optimization model for trams is proposed by modifying AM-BAND in the following aspects:. The optimization model for trams, BAM-TRAMBAND, is proposed with constraints of dwell time, active priority, and minimum bandwidth.
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