闻名于世的长安街,道路够宽阔,可是“街道”两边并不通畅?长安街两旁几乎集中了北京全部的称作为代表北京,乃至中国的“好”建筑。但是,街道的功能是用来走路的,却不是看风景的。为了保证长安街这条东西大道的通畅,长安街上是很少允许车辆掉头的。在主要路段,自南向北行驶,禁止左拐。可见,长安街的畅通是以牺牲两边的交通流量为代价的,于是南北路梗阻就是 The world famous Chang An Avenue, the road is wide enough, but the “streets” are not smooth on both sides of the streets of Chang’an Avenue, almost all concentrated in Beijing as the representative of Beijing, China and even the “good” buildings. However, the function of the street is to walk, but not to see the scenery. Chang’an Avenue in order to ensure the smoothness of this road, Chang’an Street is rarely allowed to turn around. In the main road, from south to north, forbidden to turn left. Visible, Chang An Avenue smooth flow at the expense of traffic on both sides at the expense, so South and North Road obstruction is