In November 2017 BRO announced the plan to construct 17 road and rail tunnels, with a total length of 100 km, on some of the 73 strategic roads on Sino-Indian border to provide the year-round all-weather rail and road surface connectivity. Currently, surface access to high altitude posts on Sino-India border is closed for six months every year due to snowfall and rain, and supplies are through air lift only. Some of these 17 tunnels are already under construction, including Srinagar-Kargil-Leh NH1 in J&K (Zoji La pass tunnel), Leh-Manali Highway in J&K and Himachal Pradesh (Lungalacha La, Bara-lacha la, Tanglang La, Shingo La near Nimo and Rohtang Tunnel), 578 meter Theng Pass tunnel on NH310A between Chungthang and Tung in North Sikkim, Nechipu Pass (near Bomdila) and Sela Pass tunnels on Bogibeel Assam to Sagalee to Tawang NH13 in Arunachal Pradesh. This will reduce the travel time and operational costs, eliminate the risk of avalanche and landslide.