National Highway 4B from Lang Son province to Quang Ninh is about 102.9km long. Of which, the section in Quang Ninh province is 25.7km long, with the starting point at Km80+00 in Dien Xa commune (the border between Lang Son province and Quang Ninh province) and the end point at Km107+00 in Mui Chua Port area, Tien Yen commune, Quang Ninh province.
The current status of this route is a grade 4 mountainous road, with a roadbed width of 7.5m; road surface width of 6.5m. However, 2.6km of National Highway 4B overlaps with National Highway 18A with the scale of a grade 3 mountainous road.
To facilitate traffic connections between areas in Quang Ninh province as well as Lang Son province, Quang Ninh province invests in renovating and upgrading National Highway 4B from a grade 4 mountainous road to a grade 3 plain and hill road, with a design speed of 80km/h.
The length of the route is about 22.9 km, including 2 sections.
Section 1 (adjacent to Lang Son province at Km80+00, National Highway 4B to the road connecting National Highway 4B with National Highway 18C) is about 12.7km long, with a scale of 2 lanes, and a roadbed width of 12m. Section 2 (from the road connecting National Highway 4B with National Highway18C to Van Don - Mong Cai Expressway) is about 10.2km long, with a scale of 4 lanes, and a roadbed width of 17m.
The total investment capital of the project is 1,804.24 billion VND, from the budget, of which about 380 billion VND is for compensation and site clearance.
The project implementation period is 2025-2028.
According to the national road network planning, route 19. Ring Road 1 is about 1,382 km long from Mui Chua port, Quang Ninh to A Pa Chai border gate, Dien Bien province. This belt includes national highways: National Highway 4, National Highway 4A, National Highway 4B, National Highway 4D and National Highway 4H.
Previously, Quang Ninh province also completed the upgrading of Road 342, passing through the old Ba Che district, about 23km long, connecting with the old Dinh Lap district of Lang Son province.
