China on Wednesday completed the main structure of the world's longest cross-sea road-rail bridge in its southeastern province of Fujian. The last steel truss girder, weighing 473 tonnes, was bolted on the Pingtan Strait Road-rail Bridge, another mega project in China, on Wednesday morning. With a staggering span of 16.34 km, the bridge connects Pingtan Island and four nearby islets to the mainland of Fujian Province.