India's longest surface tunnel at Chenani in Jammu's Udhampur district is complete. The 9-km-long tunnel passes through the Himalayas on Jammu- Srinagar National Highway and will be open to traffic soon following successful completion of trial run. Prime Minister Narendra Modi is likely to inaugurate the highway tunnel by the end of March. "The tunnel will be formally thrown open to general vehicular traffic after the inauguration by Prime Minister Narendra Modi soon," said J S Rathore, Project Director Chenani Nashiri Tunnelway Ltd.