evidence: Prime Minister Narendra Modi on Sunday inaugurated the country’s longest road tunnel that links the Kashmir Valley with Jammu. The tunnel, bypassing snow-bound upper reaches, will reduce the journey time by two hours and provide a safe, all-weather route to commuters travelling from Jammu and Udhampur to Ramban, Banihal and Srinagar. Here are some interesting facts about the Chenani-Nashri tunnel: - Built at Rs 3,720 crore, the tunnel will reduce the distance between Jammu and Srinagar from 41 km to 9.2 km - 1,500 engineers, geologists, skilled workers and labourers worked on the project - 92.7 FM is mandatory for vehicles where emergency messages will be relayed - 6,000 LED multiple colour lights will be used to break monotony - GSM phones will work inside the tunnel. 118 SOS boxes have been set up, one every 150 metres on both sides - Smoke and heat dampeners will react quickly in fire incidents - 118 CCTVs, one every 75 metres - At 5Okm/hr speed, the tunnel is a 12 to 15 minutes drive - Each tube has a diameter of 13 metres, while sideway has a diameter of 6 metres - Rs.