| Roundabouts have played a very important role in the urban traffic history.However,with the increasing urban traffic,roundabaout can not meet its demand.To solve this problem,a variety of specilists and scholars put foward a series of projects,this article mainly research on roundabout of signal control.Firstly,this essay simply introduced roundabouts from these asppects of the center island shape,center island radius,ensure ring road weaving section,the ring width and ensure weaving angel.lt introduces the classification and theApplication of the roundabouts properly at the same time.Secondly,based on the signal control roundabouts,it emphatically analyzes the single signal control mode and the dual signal control mode.it introduces the single signal control on these aspects which includes phase sequence design and eascertain of each phase green time.However,the dual signal control mode is researched more detailed.Drawing into basic idea,detailed introduction about which got that includes these aspects:the processing technology on improving the design of roundabout,the phase sequence design and the ascertain of the main parameters of signal control.At the same time,it draws into the dual signal control mode on minimum delay.It researches these two kinds of control methods on the traffic capacity calculation in depth.It reaches the traffic capacity calculation of the single signal control mode and the dual signal control mode according to conflict characteristics,and the set creteria of which.Besides.It simple analyzes the delay and conflict characteristics.generalizes the effects of temporal and spatial parameters on the capacity.At last,through the improvemeng scheme of Yongzhou city Lingling District rotary intersection,it reaches the conclusion that the signal control on the roundabout can effectively solve the congestion problem and the dual signal control mode have more superiority than the single signal control mode on the aspect of the traffic capacity enhancement. |
