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813 furlongs is about one-and-two-fifths times as as The 405.
In other words, it's 1.4034 times the of The 405, and the of The 405 is 0.71256 times that amount.
(a.k.a. I-405, Interstate 405, San DIego Freeway) (Southern California)
Running from Irvine to San Fernando, The 405 runs a total of 579.32 furlongs. The 405 is the most heavily-trafficed freeway in the United States, with an average speed as low as 8 kph during rush hours.
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