5 meters.

The Nantong Hongjiang Road Viaduct is a viaduct built by Nantong to alleviate highway traffic congestion. It has a total length of 909 meters and a width of 25.5 meters. The ground road has a total length of 1,200 meters, a standard width of 40 meters, and a height of 5 meters.

Nantong, referred to as Tong, is a prefecture-level city in Jiangsu Province. It borders the Yangtze River to the south and is located at the intersection of the eastern coastline of China and the Yangtze River. It belongs to the alluvial plain of the Yangtze River Delta and is in a subtropical monsoon climate zone.