I’ve always heard it said that building more lanes doesn’t help but I still don’t understand why. Obviously 8 wouldn’t help anymore than 7 but 3, 4, or maybe 5 for long eways helps traffic filter though especially with the varying speeds.
Traffic backs up, so you go take the side roads. New lane is added, so traffic isn’t backed up anymore and you decide to not take the side roads. Enough people make the same decision that traffic backs up again. Repeat.
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