多方式出行条件下T型交叉口交通渠化方法分析

An Analysis of the Traffic Channelization Method at T Intersections with Multiple Traffic Modes

目前我国乃至北京市尚无非灯控T型交叉口各种交通渠化的相关规范和标准,实践中也无成熟的方法.为改善非灯控T型交叉口的交通安全和舒适性,北京市专门针对三环辅路3种类似的非灯控T型交叉口采取了3种不同的交通渠化方案.为研究这3种处置措施的有效性和优劣,采用路口非机动车侵占机动车道的侵占率和右转机动车让行率2项指标进行评价.通过进行方案实施前后现场对比调查、分析和计算,得到三环辅路非灯控T型交叉口设置自行车落地标与红色彩铺块对改善交通秩序以及提高路口安全性和有序性效果最好,其次是自行车落地标方案,连续彩铺自行车道方案最差.结论可为其他类似路口的处置提供依据.

T-intersections are an important type of traffic nodes in the Beijing urban road network. This paper focuses on traffic channelization at unsignalized T intersections between major arterials road and minor roads. Unlike signalized T intersections,unsignalized T intersections do not a clear definition of right of way,which often causes erious conflicts among pedestrians,bicycles and motor vehicles. At present,there are still no relevant norms and standards for traffic channelization at unsignalized T intersections in China. In order to improve the safety and comfort of the traffic users at unsignalized T intersections,Beijing has carried out three different kinds of traffic channelization schemes at three similar unsignalized T-intersections along the 3 rd Ring Road of Beijing. To examine the effectiveness and advantages and disadvantages of these three kinds of schemes,we use two evaluation indexes： the rate of non-motorized vehicles encroaching motor vehicle lanes and the rate of right turn motor vehicles yielding bicycles. We did field investigation of the three schemes, then conducted the data analysis and calculation. The conclusion is that marking the intersection with red blocks and bicycle symbols is the best way to improve the traffic order and the safety of T intersections. The scheme of continuous colored paved bicycle lane is the least effective. The conclusion can provide the basis for improving other similar intersections.