The north-east (NE) region of India lags behind the rest of the country in several development indicators. Although infrastructure has developed over the years, the region has to go a long way to level up the national standard. The total road network of about 377 thousand km of NE contributes about 9.94 per cent of the total roads in the country. Road density in terms of road length per thousand km2. area is very poor in hilly state of Arunachal Pradesh, Mizoram, Meghalaya and Sikkim, while it is significantly high in Tripura and Assam. The road length per 100 km2 area in NE districts varies from as less as below 10 km (in Arunachal Pradesh) to more than 200 km (in Tripura). Other means of transport such as rail, air and water is insignificant in NE (except Assam); however, a few cities of these states having direct air connectivity in the region. The total railway network in the NE is 2602 km (as on 2011), which is only about 4 per cent of the total rail network of the country. Constructions of roads build the road map for development and road is the only means of mass transport for the entire NE of India. Due to hilly terrain and varied altitudes, rail transport is mainly confined to Assam and water transport is almost non-existent.