Shanghai is a major hub of China's expressway network. Many national expressways (prefixed with the letter G) pass through or end in Shanghai, including Jinghu Expressway (overlaps with Hurong Expressway), Shenhai Expressway, Hushaan Expressway, Huyu Expressway, Hukun Expressway (overlaps with Hangzhou Bay Ring Expressway), and Shanghai Ring Expressway. There are also numerous municipal expressways prefixed with the letter S. As of 2019, Shanghai has a total of 12 bridges and 14 tunnels crossing the Huangpu River. The Shanghai Yangtze River Bridge is the city's only bridge–tunnel complex across Yangtze River.