This is The Longest Road Tunnel in the World

If you hold your breath in this tunnel, you might pass out

Lærdal Tunnel
In addition to being long, Lærdal Tunnel is beautiful, illuminated in fluorescent colors for those of you who are afraid of the dark. Svein-Magne Tunli

If you were a fan of Tiny Toon Adventures back in the early 90s, you might remember an episode that entailed Hampton Pig's family going on a trip to Happy World Land. In this case, as is usually true in travel, the journey was more important than the destination.

Specifically, the fact that Hampton's father wanted to save on air conditioning while driving through the scorching desert, a circumstance made even more agonizing when the family decided to follow superstition by holding their breath through what seems to be the longest tunnel in the world.

Even if you weren't a fan of Tiny Toons, it's difficult not to marvel at Norway's Lærdal Tunnel, currently the world's longest road tunnel. Here's why it's such a modern marvel—and why you won't want to follow Hampton Pig's example, and try to hold your breath all the way through it.

How Long is Lærdal Tunnel?

At 24 kilometers or just over 15 miles in length, Norway's Lærdal Tunnel is the longest tunnel in the world. Assuming no traffic, it takes about 18 minutes to drive through this road tunnel if you're going the speed limit of 80 km/hr.

Of course, traffic can definitely build up in the tunnel. Likewise, if you're driving through the longest tunnel in the world during an off-peak period, you'll see many fellow drivers exceeding the speed limit, in spite of the fact that speed cameras are installed inside.

History of the Lærdal Tunnel

Construction on Lærdal Tunnel began in 1995, as a response to the difficult of traveling between Norway's two largest cities—Oslo and Bergen—particularly during winter, which requires treacherous driving over the icy mountains under which the tunnel is built, or during summer, during which ferries through the country's various fjords and lakes were necessary to bridge many parts of the distance.

The road tunnel opened in 2000, after five years of construction and the excavation of 3 million cubic yards of rock. The total cost of the tunnel, which now serves more than 1,000 cars per day, was around 1.1 billion Norewgian krone (~$113 million U.S.). Interestingly, the Norwegian government does not currently attempt to offset the construction of the longest tunnel in the world with tolls.

How to Travel Through the Lærdal Tunnel

If you take a road trip through Norway, you will almost certainly need to travel between Oslo and Bergen (or vice-versa), and your routing will almost certainly take you along the E16, the road whose passage necessitated the building of the Lærdal Tunnel. If you're afraid (not sure how you even made it this far, to be honest), there are a few points of interest that should make you feel better.

The tunnel is extremely safe. First of all, the darkness inside the tunnel cave is broken not just by any light, but by colorful, fluorescent lights that make them look almost beautiful, not unlike the Salt Cathedral in Colombia.

Secondly, emergency exists have been installed every 1,600 feet or so, and numerous speed cameras make sure no driver endangers the safety of others while inside the longest tunnel in the world. There are even "rumble strips" take make awful noises when you begin to veer, preventing you from falling asleep as you drive, God forbid.

Future Tunnels Longer Than Lærdal Tunnel

Although Lærdal Tunnel is currently the world's longest road tunnel, it's not the longest tunnel overall. The top six on the list are all water aqueducts (the longest being the 85-mile Delaware Aqueduct in New York State), while dozens of subway tunnels all around the world are longer than the Lærdal Tunnel.

Although Lærdal might remain the longest exclusively road-use tunnel for some time to come, its overall length has recently been eclipsed, by another one in Europe. The Gotthard Base Tunnel, whose road tunnel is much shorter than Lærdal's, opened in h in 2016 with a length of more than 57 kilometers (35 miles), longer than the currently rail tunnel record holder, which is Japan's Seikan Tunnel.

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