The Shanghai Ring Expressway (Chinese: 上海绕城高速公路; pinyin: Shànghǎi Ràochéng Gāosù Gōnglù), designated G1503, formerly designated as A30 and G1501, and also known as the Shanghai Suburb Ring Expressway (Chinese: 上海郊环高速公路; pinyin: Shànghǎi Jiāohuán Gāosù Gōnglù), is a 209.22-kilometre-long ring expressway (130.00 mi)[1] that encircles Shanghai, a direct-controlled municipality in the People's Republic of China. It is entirely in Shanghai, except for a small section in the nearby province of Jiangsu at its northwest end.
The kilometre zero of the Shanghai Ring Expressway is located at an interchange with S20 Outer Ring Expressway and Yixian Elevated Road in Baoshan District, and increase in a clockwise fashion. Immediately to the east of the interchange, the expressway descends into the Outer Ring Tunnel, so named because this section is concurrent with S20 Outer Ring Expressway. As the tunnel ends in Pudong New Area, it becomes an elevated highway for a short portion, curving southeast and then south, reaching the Wuzhou Avenue Interchange. Here, the concurrency with S20 Outer Ring Expressway ends, with the Outer Ring Expressway continuing to the south, Wuzhou Avenue to the west, while the Shanghai Ring Expressway continues east.
The expressway turns east, back into the Jiading District of Shanghai, where it intersects with the G15 Shenyang–Haikou Expressway and the S5 Shanghai–Jiading Expressway. Re-entering Baoshan District, the expressway becomes an elevated road, travelling above Fujin Road. At Tongji Road, the expressway curves to the south, paralleling the elevated Line 3 of the Shanghai Metro. This section is also known as Tongji Elevated Road, due to the fact that it runs above Tongji Road. At the southern end of Tongji Elevated Road, the Shanghai Ring Expressway returns to its kilometre zero marker.