The North-South Expressway, Nghi Son - Dien Chau section, has 6 lanes.

Road with speed 100-120km/h

According to the design, the North-South expressway component project, Nghi Son - Dien Chau section, has its starting point (Km380+000) after the intersection with Nghi Son - Bai Tranh road, the route goes south, about 80 km from Khe Nhoi Lake dam, then crosses Mong Ga mountain through Truong Vinh tunnel, crosses Hoang Mai river and crosses Ba Chop mountain in the area between Khe May lake and An Nghia lake, turns right to intersect National Highway 48B (formerly Provincial Road 537), crosses Cau Giat - Nghia Dan railway, intersects National Highway 48 in Dien Doai commune.

The route continues about 2 km west of National Highway 1A, intersects National Highway 7B (formerly Provincial Road 538), then intersects with National Highway 7 and ends at Dien Cat - Dien Chau (Nghe An).

The road is built as a class 100-120 highway, with a design speed of 100-120 km/h (according to TCVN highway standards). The investment phase has a scale of 4 lanes and a total route length of about 50.0 km. The completed phase has a scale of 6 lanes.

Graphic of the section through Dien Chau. Photo: Lam Tung

North-South Expressway, Nghi Son – Dien Chau section, 23 bridge projects.

Of which, there are 13 bridges on highways; 9 bridges on level crossings over highways and 1 bridge at interchanges.

Specifically: Bridges on the highway include: Khe Nhoi Bridge (17.5m wide), Hoang Mai 2 Bridge (17.5m), Ba Ra Bridge (17.5m), Quynh Tan Bridge (17.5m), An Nghia Bridge (17.5m), Quynh Luu Bridge (17.5m), Ngoc Chi Bridge (17.5m), DH 258 Bridge (17.5m), Yen Hoi Bridge (17.5m), Gia Hoi Bridge (17.5m), Nguyen Thuong Bridge (17.5m), Dong En Bridge (17.5m), Dien Cat Bridge (24.5m).

Bridges on the highway level crossing include: Truong Lam Bridge (12m wide), Quynh Vinh Bridge (12m), Quynh Trang Bridge (9m), Quynh Lam Bridge (7.5m), Dien Doai Bridge (12m), Do Thanh Bridge (7.5m), Dien Lien Bridge (7.5m), Dien Dong Bridge (12m), Dien Quang Bridge (7.5m).

Map of the North-South Expressway section through Quynh Luu. Photo: Tran Chau

The route has 3 different level intersections, which are the intersections with National Highway 48D, the intersection with National Highway 48B and the intersection with National Highway 7.

On the construction route, a tunnel project of Truong Vinh cuts through Mong Ga mountain, with an estimated length of 450m.

Bridge works are designed according to standards TCVN 11823-1:2017 to TCVN 11823-14:2017 with bridge width suitable for roadbed width; in which bridges on expressways: include 4 expressway lanes; direct overpasses: Bridge width suitable for current road scale, with consideration to suit planning (if any); bridges in interchanges, bridges on intersection branches have bridge width suitable for the scale of connecting branches.

The total investment for the phase is 8,380.67 billion VND, including: construction and equipment costs 5,124.28 billion VND; Land acquisition and resettlement costs (including contingency) 1,423.48 billion VND.