The main highway of Arunachal Pradesh is the Trans-Arunachal Highway, National Highway 13 (1,293 km (803 mi); formerly NH-229 and NH-52). It originates in Tawang and spans most of the width of Arunachal Pradesh, then crosses south into Assam and ends at Wakro. The project was announced by then Prime Minister Manmohan Singh in 2008 for completion by 2015–16, but only became operational in 2018.