Article Detail Which is Longest road tunnel in the World ? Answer: Lærdal Tunnel (Norway - 24.51 kilometre) Similar Questions : 1. Which is smallest state by area of India ? Answer: Goa 2. Which is Largest railway route in India ? Answer: Dibrugarh in Assam to Kannyakumari in Tamil Nadu. 3. Which is the longest road in India ? Answer: Grand Trunk Road (2500 Km) 4. Which is the state largest by area in India ? Answer: Rajasthan 5. Which is Largest library in the world ? Answer: United State Library of Congress, Washington D.C. 6. Which is longest railway station ? Answer: Grand Central Terminal, Chicago(USA). 7. Which is the highest dam in India ? Answer: Tehri Dam on Bhagirathi River in Uttarakhand (Height of 260 metres) Read more from - Longest and Largest