| Summary |
Ming-Chuan Hsu,2007.06
Department of Transportation Technology and Management National Chiao Tung University
Signalized intersections are always the main traffic bottlenecks of road system in urban areas, and it is the most frequently place to cause delay and conflict of the vehicles. Therefore, how to analyze the traffic characteristics effectively and provide safe, efficient and fluency strategy in time are very important issues for signalized intersections.
Because discharging characteristics of the vehicles at intersections impact seriously on estimating capacity, discharge rates are often applied to change into saturated flow rates estimating theoretical capacity. Therefore, it played a quite important role in all road capacity analyses.
Many studies of the queuing discharging behavior at the intersection, usually discussed the stable discharging rate of the passenger cars, or analyzed discharging characteristics of the heavy vehicles by transferring the passenger-car-equivalent. Few studies discussed in the microscope method and analyzed the vehicles types discharging characteristics of ordered vehicle before they are unstably and stably discharged. It is worth for study. Ordered vehicles mean the relative ordered position of queuing vehicles stopping in front of the stop line during red light. So this study aims at the characteristics of the straight traffic flow under simple signalized intersection, and analyzes the discharging characteristics of unstable and stable discharging traffic flow at the signalized intersection. According to forward-backward two types of vehicles, we classify four sets of vehicles samples as heavy-heavy, heavy-small, small-heavy, and small-small, and discuss the difference of the combination of two types of vehicles. Then we construct the Microscopic Discharging Model of Ordered Straight Vehicles. Besides, we find some characteristics that some vehicles start at the intersection before the green light phase begins. We will discuss the characteristics of this behavior. The results of this study could be referenced for the base for estimating the capacity of lanes, designing signal, the relevant research and etc. |
