If highway speed limits of 70-80 miles per hour is too slow for you, pay a visit to Holloman Air Force Base in south-central New Mexico, in the U.S. Operated by United States Department of Defense, Holloman is home to the world's longest and fastest high speed test track at 15.47 km in length, and consequently the world’s highest enforced speed limit. A sign near the track announces, in all seriousness – “Mach 10”. Ten times the speed of sound or 7,612.07 miles per hour. That’s how fast you are officially allowed to go, and is probably the only speed limit that you can break and get applauded for instead of being issued a ticket. Nobody has broken it yet – the fastest land speed record at Holloman High Speed Test Track is Mach 8.5 set in April 2003.

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