Article Detail Which is Longest road tunnel in the World ? Answer: Lærdal Tunnel (Norway - 24.51 kilometre) Similar Questions : 1. Which is the longest Platform ? Answer: Gorakhpur railway station, Uttar Pradesh, India (1355.40 meters) 2. Which is the largest gulf ? Answer: Gulf of Mexico 3. Which is Highest Gallantry Award in India ? Answer: Paramveer Chakra 4. Which is largest Dome in India ? Answer: Gol Gumbaz (Karnataka) 5. Which is the Densest populated State of India ? Answer: West Bengal 6. Which is the Densest populated State of India ? Answer: West Bengal 7. Which is Largest forest state of India ? Answer: M.P. Read more from - Longest and Largest