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21,000,000 ells is about five times as long as I-80
In other words, it's 5.175260 times the length of I-80, and the length of I-80 is 0.1932270 times that amount.
(a.k.a. Interstate 80, a.k.a. Keystone Shortway) (net length)
Interstate 80, crosses the continent of North America from Teaneck, New Jersey to San Francisco, California and covers a total length of 4,057,770 ells. A 52,493.40 ells stretch between mile marker 318 in Grand Island, Nebraska and mile marker 390 in Lincoln, Nebraska is the longest straight path in the US Interstate system.
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