S10 Baoshan–Tengchong Expressway

S10 Baoshan–Tengchong Expressway also known as Baoteng Expressway(S10保腾高速公路（保山-腾冲) is a province-level expressway in Yunnan, China. It connects the city of Baoshan and Tengchong. The expressway was built between 2007 and 2016. The key project of the expressway is a bridge named Longjiang Bridge, one of the highest in world sitting 280 m (920 ft) above the Long River below. The total cost of the expressway is approximately 4.6 billion Yuan, about 71.97 million Yuan per kilometer. It is also the first expressway which built up at volcano area in China.