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成都市道路为环行放射状。随城市规模扩大交通堵塞日趋严重。环路在放射性路网中应具有转换交通流量调节路网交通的功能，一环路路口的平交却制约了路网的功能发挥。兴建二环路是为缓解成都市的交通压力，在环路与主要放射路的交叉口应设立交桥才能发挥其作用。有鉴于此1989年?
Chengdu roads radial ring. With the expansion of urban traffic congestion is getting worse. The loop should have the function of transforming traffic flow to regulate the traffic on the road in the radioactive road network. The horizontal crossroads of the intersection of a roundabout restrict the function of the road network. The construction of the Second Ring Road is to ease the traffic pressure in Chengdu. It is necessary to establish cross-roads at the intersection of the ring road and the main radio-frequency road to play its role. In view of this 1989?