It runs from LAC in Tawang in northwest to Kanubari in southeast at the tri-junction of Assam-Nagaland-Arunachal Pradesh.
It starts from India's north most military post (north of Hathung La Ridge) in Tawang district, goes via Zemithang, Tawang, Bomdila, Nechipu, Seppa, Sagalee, Yupia, Yazali, Ziro, Daporijo, Aalo, Pasighat, southern part of Dibang Valley district, Lohit, Roing, Tezu, Mahadevpur, Bordumsa, Namchik, Changlang, Khonsa, Longding, and ends at Kanubari.
[1][7] The Trans-Arunachal Highway greatly helps in reducing isolation of the people by connecting the district headquarters, major hydro electric power projects and other important places.
[8] This strategically important highway network enhances Indian military's capabilities in combating the threat of China's Western Theater Command opposite India's eastern sector of Line of Actual Control.
[9] TAH, from Tawang to Kanubari in Longding district has a target completion date of March 2024.