Correct option is A
The Laerdal Tunnel, located in Norway, is the longest road tunnel in the world, with a length of approximately 24.5 kilometers (15.2 miles). It connects the towns of Laerdal and Aurland in western Norway and provides an important road link between the capital city Oslo and the western coastal city of Bergen.
Construction and Purpose: The tunnel was completed in 2000 to create a winter-safe, all-year connection between Oslo and Bergen, since the mountain passes in the area can be closed due to heavy snowfall in the winter.
Design Features: The Laerdal Tunnel has several design features to improve safety and reduce driver fatigue. It includes large caverns, placed at intervals throughout the tunnel, designed to break the monotony of the long drive and offer rest points for drivers. These caverns are lit with blue and yellow lighting, providing an illusion of daylight and helping to keep drivers alert.
