【正文】 upstream and downstream the influence of the intersection. The urban road traffic signal control is the study of the regional coordination in a city way way zone, to each road intersections of signal period of how long, how intersection green than and between the letter at phase difference is optimized, to minimize the intersection delay parking, improve the urban road work capacity traffic signal control method coordination area. Along with the urban road area signal coordination control the development of the theory, the researchers found that, can be to a larger city road traffic area work as a great whole, the traffic signal coordination control and optimization, as a result of road work and the plexity of the flow of motor vehicles, but for the optimization results to the travel of the ability is not very ideal. Therefore, since the 1970 s, many researchers began to try to be huge, plex tedious road work according to certain principles and methods model division, divided into several signal control branch area, and then again to signal control subdomain coordinate signal control, to improve the way of city road work coordination control effect. At present, the urban road traffic congestion problem has been bee the attention and to the world. City road and intersection traffic as a city of basic services, mainly including road intersection and sections, the service performance in good operating directly affect the normal operation of city traffic. City road crossing the road system is an important ponent of the urban road through the intersection nodes to the various factors of city road connect each other of road work, to coordinate each intersection on the direction of imported cars need?；诤艉秃铺厥行鲁菂^(qū)，以新城區(qū)新華大街為主干道進(jìn)行城市道路主干道交通信號(hào)控制與優(yōu)化仿真。本節(jié)主要以十字交叉口為主，討論全無(wú)控制交叉口和主路優(yōu)先控制交叉口，同時(shí)簡(jiǎn)要介紹現(xiàn)代環(huán)形交叉口的基本要點(diǎn)?，F(xiàn)在對(duì)城市道路進(jìn)行區(qū)域協(xié)調(diào)控制就是將其劃分為多級(jí)多個(gè)信號(hào)控制子區(qū)，對(duì)信號(hào)子區(qū)進(jìn)行協(xié)調(diào)控制，優(yōu)化管理控制信號(hào)子區(qū)，然后對(duì)整個(gè)道路進(jìn)行區(qū)域協(xié)調(diào)控制，達(dá)到整個(gè)城市道路優(yōu)化的目的。國(guó)內(nèi)外城市中的交通堵塞主要發(fā)上在交叉口，造成車(chē)輛中斷，事故增多，延誤嚴(yán)重。 但交叉口也是交通堵塞和交通事故的多發(fā)地點(diǎn)。 由于新華大街各個(gè)交叉口相距很近，使得交叉口與交叉口之間的車(chē)容量較小，而且各個(gè)交叉口之間的信號(hào)燈周期時(shí)長(zhǎng)不同，不能進(jìn)行關(guān)聯(lián)管理，亦使得新華大街不能進(jìn)行綠波交通控制。 5 Synchro in traffic control and the design application