琼州海峡
The Hainan Ring Expressway is currently not connected to any other national-level expressways in China. A bridge is currently being planned from Hainan to Mainland China, over the Qiongzhou Strait. This would connect the Hainan Ring Expressway with the G15 Shenyang–Haikou Expressway and G75 Lanzhou–Haikou Expressway concurrently, which would provide a connection to the rest of the expressway system in China.