The Ministry of Construction has approved the investment policy for completing the Than Vu Tunnel project, a key component of the North–South Expressway.

The 8.2-km tunnel is part of the Dien Chau – Bai Vot expressway section of the North-South Expressway running across Nghe An province in the central region and ends at Nghi Phuong interchange in the province’s Tha Linh commune.

According to the decision, the project’s key components include completing the tunnel's left tube (in the North - South direction). with three lanes; and building a bridge and access road to the left tube, enabling the entire tunnel to operate with six lanes with a design speed of 80–100 kph.

The full completion of both tunnel tubes is considered essential to enhance traffic safety and efficiency of the expressway.

The project has a total investment capital of VND2.155 trillion ($81.9 million).

The project is scheduled for implementation from 2025 to 2027.