320国道由上海向西南方向延伸,全长70.9公里,均为二级公路。沿线经过闰行区、松江区、金山区等三区13个镇,与浙江省相连。该路由上海市公路管理处直接管辖。全线日常养护工作共分为三个标段,经过公开招标,分别由上海申闵公路养护建设有限公司,上海凯达公路工程总公司、上海金山公路建设有限公司3家养护公司中标进行养护,设有北桥、车墩、松隐3个道班,莘庄、车墩、朱泾3个交通流量观测站和亭枫养路费征收稽查站。 320国道上海段交通流量大、重型车辆多,公路沿线集镇、工厂较为集中,入城路段车站、商场众多,已趋于城市化。创建文明样板路以前,该路存在着个别路段路幅较窄、路肩缺土、边坡不规范、排水设施不齐全、公路用地范围内竖有不少非公路性标志、标牌、广告 320 State Road from Shanghai to the southwest direction, a total length of 70.9 km, are two road. Along the line after the inter-Run area, Songjiang District, Jinshan District, 13 districts and three districts, and Zhejiang Province. The route is directly under the jurisdiction of Shanghai Highway Administration. The entire line of daily maintenance work is divided into three tenders, after an open bidding, respectively, by Shanghai Shen Min Highway Maintenance and Construction Co., Ltd., Shanghai Kaida Highway Engineering Corporation, Shanghai Jinshan Highway Construction Co., Ltd. three conservation companies bid for conservation, North Bridge, car pier, Songyin 3 Road classes, Xinzhuang, car pier, Zhujing 3 traffic flow station and Ting Feng maintenance fee collection station. 320 State Road Shanghai traffic flow, heavy vehicles, the market along the highway town, factories are more concentrated, into the city section of the station, many shopping malls, has become urbanized. Prior to the establishment of a civilized model road, there were narrow road sections on individual roads, lack of roads and shoulders, non-standard side slopes and inadequate drainage facilities. Many non-road signs, signs, advertisements