无信号交叉口左转专用道设置研究

Left-turning Roads Setting at Unsignalized Intersections

无信号交叉口的许多交通冲突与左转车流有关。左转车流与对面方向直行车流存在冲突,也和与之相交道路的直行和左转车流相冲突。在无信号交叉口处适当地设置左转专用道,能有效地减少冲突,减少因左转车干扰而产生的延误。运用交通流理论、概率论和排队论知识,研究了在无信号交叉口处是否应设置左转专用道,设置左转专用道时的服务水平,左转专用道的设置与所考虑的相关因素之间的关系等,并建立了相关的模型。

At unsignalized intersection,many traffic collisions have relation with the left-turn traffic flows.The left-turning traffic flow may collide with the straight and left-turning flows of the opposite direction and intersected roads.At the unsignalized intersection,setting propriety left-turning roads can decrease collisions and delay effectively.Whether the left-turning roads should be set up or not depends on the straight and left-turning traffic flows and the opposite directions,the intersection's geometry form,the planning and practical traffic speeds and the traffic compositions.By using traffic flow theory,probability theory and queue theory,this paper studied the relations between the conditions of setting up special left-turning roads and the above factors.The relevant models was established.