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The original was posted on /r/interestingasfuck by /u/ilikepineapples987 on 2023-08-23 18:52:04.

Original Title: This is Lærdal Tunnel, located in Norway. At 24.51 km/15.2 mi it’s the longest road tunnel in the world. For safety, to reduce monotony, it has caverns every 6 km that are lit with blue and yellow lights. They can be used for rest stops. The entire tunnel was built for only $113M