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A comment on Phantom traffic jams, and why lane expansion isn’t really successful. Parent comment

Re:Phantom traffic jams, and why lane expansion isn’t really... by bryanlarsen on Monday July 02, 2018 @08:29PM (#17446542)
At 10mph, safe following distance is 1.8 seconds. At 60mph, safe following distance is 3.6 seconds. At 90mph, safe following distance is 4.4 seconds.

http://www.adventures-in-education.com/math/StoppingDistance...

https://en.wikipedia.org/wiki/Braking_distance

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