Across bridges and inland piers, through tunnels and switchbacks, sinkholes and mines, across karst bedrock and the terrain of old wars: the Chinese are building their highway system. "Within a decade, central planners expect to have a world class transport system to move goods and people safely between urban centers at speeds of 60 to 100 kilometers per hour." Via some geotechnical wizardry: "Slopes are steep and elevation along the expressway route rises from 420 to 1,450 meters above sea level. The region is seismically active and rainfall averages 850 to 1,600mm annually in a subtropical monsoon climate. Landslides are common." From ENR.