Article Detail Which is Longest road tunnel in the World ? Answer: Lærdal Tunnel (Norway - 24.51 kilometre) Similar Questions : 1. Which is longest river in world ? Answer: Nile, Africa 2. Which is the shortest day in the year ? Answer: December 22 3. Which is the lightest gas ? Answer: Hydrogen 4. Which is the longest day in the year ? Answer: June 21 5. Which is longest railway station ? Answer: Grand Central Terminal, Chicago(USA). 6. Which is Largest railway route in India ? Answer: Dibrugarh in Assam to Kannyakumari in Tamil Nadu. 7. Which is the lightest metal ? Answer: Lithium Read more from - Longest and Largest