The total length of roads in Nepal is recorded to be , as of 2003–04. This fairly large network has helped the economic development of the country, particularly in the fields of agriculture, horticulture, vegetable farming, industry and also tourism. In view of the hilly terrain, transportation takes place in Kathmandu are mainly by road and air. Kathmandu is connected by the Tribhuvan Highway to the south connecting India, Prithvi Highway to the west and Araniko Highway to the north connecting China. The BP Highway connects Kathmandu to the eastern part of Nepal through Sindhuli. The fast-track is under construction which will be the shortest route to connect Terai with the valley.