并且对城市环路建设的作用，分期实施的必要性，高架路在环路中的地位进行了探讨。
It also discusses function of city circular road construction, the necessity of performing by stages and the station of viaduct in circular road.
最终对于城市路网设置环路提出一系列建议。
At last, author offer proposals for planning ring road in city.
就拿北京来说，城市已扩到六环路又建成了新地铁，可路上依然挤满了汽车，交通拥塞依然存在。
Take Beijing as an example, with the city extending to even the sixth ring road and new subways built, roads are still packed with cars, and traffic congestion still exists.
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