The road corridor is an important link to Gangtok and other parts of Sikkim.
Tunnels, viaducts to tackle Himalayan terrain
Gadkari said the project has been designed for the challenging Himalayan terrain. It will include tunnels, viaducts, bridges and cut-and-cover sections, along with comprehensive slope-protection measures.
The work is aimed at making the route safer and more resilient while improving connectivity to Gangtok.
The project will also address sections vulnerable to landslides and sinking, Gadkari said.
The upgraded corridor is expected to improve the movement of tourists as well as agricultural and horticultural produce. It will also make it easier to move essential goods across the state.
Beyond civilian connectivity, Gadkari said the project would strengthen strategic connectivity for the movement of defence personnel and supplies. The highway upgrade is also expected to contribute to Sikkim's broader socio-economic development.
In August this year, the Centre approved the construction of a four-lane, access-controlled highway connecting Baihata Chariali near Guwahati to Tezpur in Assam. The 135.871-km project, approved at a total capital cost of ₹8,970.20 crore, is aimed at improving connectivity across Assam and to Arunachal Pradesh.
The corridor is also expected to cut travel time by half and double average travel speeds, while improving road safety, fuel efficiency and vehicle operating costs. It will connect key economic, social, tourism and logistics hubs, including Kaziranga National Park, Orang National Park, major railway stations, airports and waterway terminals.