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331.10 kilometers is about three times as long as The 405.
In other words, it's 2.84110 times the length of The 405, and the length of The 405 is 0.351980 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 116.541 km. 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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