Excavation of the longest tunnel of the North-South Expressway, which is part of the Quang Ngai – Hoai Nhon section (in the country's central region), has been complete, according to the investor of the expressway section.

The 3,200m long tunnel is one among three tunnels of the 88-km Quang Ngai – Hoai Nhon section. The section connects the two neighboring provinces of  Quang Ngai and Gia Lai.

Total investment capital for the section is estimated at over VND20.4 trillion ($864 million).

The expressway section was designed to have four lanes, allowing a maximum speed of 80 kph.

The section is among 12 sub-projects of the North-South Expressway.