The consortium has sought approval from the Ministry of Construction to study and invest in the project under a public-private partnership (PPP) model, with central government funding support.
The proposed expressway forms part of the northern midland ring road and is listed as a second-priority project under Vietnam's 2026-2030 expressway investment programme.
The route would run approximately 70 kilometres through Lang Son Province and 50 kilometres through Thai Nguyen Province.
The four-lane expressway would have a design speed of 100 kilometres per hour, reduced to 80 kilometres per hour on sections crossing difficult terrain in Lang Son.
Preliminary investment estimates put the Lang Son section at around VND 18 trillion and the Thai Nguyen section at VND 11 trillion.
According to the consortium, the project would address transport bottlenecks between the two provinces, which currently rely largely on National Highway 1B.
The existing road has two to four lanes and passes through mountainous terrain, with sharp bends and steep gradients posing safety risks and limiting its ability to accommodate growing traffic.
The proposed expressway is expected to shorten journey times, improve logistics and cross-border trade, and strengthen regional links with Phu Tho, Tuyen Quang and Cao Bang provinces.
If approved, the consortium said it would mobilise the necessary financing, technical expertise and equipment while coordinating with local and central authorities on project preparation, land clearance and construction.