Logic Rule-Based Bus Rapid Transit Signal Priority of Controlling Overflow for Bus on Schedule

摘要

Many transit agencies are currently considering implementing priority systems in cities intersection control system. These agencies which provide buses with temporary green signal and early green recall. While numerous studies have devaluated a potential reduction for bus delay and negative traffic impacts, very few have referred to the problem caused by bus overflow of far-side bus stops. If there existing a model which can estimate the dwell time of buses at bus stops, combining the dwell time with the priority strategy it will reduce the negative impact of bus overflow and improve the control performance to some extent. This paper presents a overflow control logic which is combined with buses on schedule to control signal priority. According to these observed data of bus stops a dwell time model was built and used in the overflow controlling logic. At the same time, considering buses on schedule the logic of this paper takes control of these signals to adjust the on schedule of buses to some extent. Results of VISSIM simulation compared with simple priority system show that the proposed control strategy can reduce bus transit delay as well as reduce social car wait time improving the efficiency of the intersection.