CREC is the main force of bridge construction. It has designed and built more than 10,000 river-spanning and sea-crossing bridges, including Wuhan Yangtze River Bridge as China's first bridge over Yangtze River, Nanjing Yangtze River Bridge as China's first rail-cum-road bridge, Wuhan Tianxingzhou Yangtze River Bridge as the rail-cum-road bridge owning four world firsts, Nanjing Dashengguan Yangzi River Bridge as China's first six-lane railway bridge, Zhengzhou Yellow River Bridge as the world's longest rail-cum-road bridge, Beijing-Shanghai High-Speed Rail Danyang-Kunshan Grand Bridge as the world's longest bridge with a total length of 164.851 kilometers , Shanghai-Nantong Road-Railway Yangtze River Bridge as the rail-cum-road cable-stayed bridge with the largest span in the world, Yingwuzhou Yangtze River Bridge as three-tower and four-span suspension bridge with the largest span in the world, Donghai Bridge as China's first sea-crossing bridge, Qingdao Jiaozhou Bay Sea-Crossing Bridge as the world's longest sea-crossing bridge, Hangzhou Bay Sea-Crossing Bridge as the world's third longest sea-crossing bridge. The total length of these bridges (more than 17,000 kilometers) is 2/5 that of terrestrial equator.