Why do people slow down in tunnels?

The instinctive thought might be that a tunnel, visually, suggests a constriction up ahead. The lanes are just as wide, but the visual clue is powerful. A dark hole up ahead, even when we have approached it a thousand times, is still a dark hole up ahead.



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The instinctive thought might be that a tunnel, visually, suggests a constriction up ahead. The lanes are just as wide, but the visual clue is powerful. A dark hole up ahead, even when we have approached it a thousand times, is still a dark hole up ahead.

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Being 25 km long the Laerdal Tunnel i Norway is the world's longest road tunnel - and it is equipped with support and cable ladders from Oglaend System. To ease the drive through the 25 km long tunnel, there is a huge hall every 6 km.

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The Laerdal Tunnel in western Norway is the longest road tunnel in the world. It takes about 20 minutes to pass through the tunnel. Brightly colored lights placed every six kilometers help drivers stay alert.

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Accidents in tunnels are more dangerous than in the open air. An explosion or fire may cause considerable damage and hazardous substances cannot be removed quickly. Smoke causes poor visibility, lack of oxygen rapidly occurs and there may be panic. It is difficult to escape from a tunnel.

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China???????? has the most number of tunnels in the world. There are 16229 tunnels in China. The largest tunnel in China is Bohai Strait Tunnel. After China, Japan???????? has the most number of tunnels in the world.

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