A mega bridge connecting three remote southwest China's provinces will have its main structure joined soon. Named Jimingsansheng Bridge, the arch bridge joins the Yunnan, Guizhou and Sichuan provinces. Builders said they had to overcome extraordinary difficulties, some of which had never been seen in previous projects, due to the rough terrain and rugged limestone cliffs. Construction of the bridge began in 2016, and it is scheduled to open to traffic at the end of this year.