Adaptive traffic signal control under mixed traffic condition

The growing use of powered two wheelers (PTWs), coupled with their unique moving behaviors, has considerably influenced the overall trac characteristics, requiring new approaches to trac management and monitoring strategies. The present paper

studies the eect of two-wheelers trac on adaptive trac signal control (ASC) and the methods to optimize the control plan for trac flow consisting of PTWs and cars. For this reason, the queue build-up and dissipation processes are analyzed with a gradual increase of PTWs ratio. Besides, the eect of advanced stop lines, which are intended to give a head start for PTWs on the onset of the green period, on the queue build-up and dissipation processes is also studied. Based on queue clearance time analysis for dierent trac compositions, the possible erroneous estimate of green time length resulted from the existing adaptive signal control approaches is presented. Furthermore, the flow rate of vehicles discharging from a queue is examined and a passenger car unit (PCU) value of PTW is computed. Finally, an eective green time allocation technique is devised to integrate PTWs in ASC signal plans. Simulation results show that the proposed technique leads to a promising improvement. For the study, a macroscopic model designed to capture the trac dynamics of mixed trac flow consisting of PTWs and cars is employed.