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.
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If you had infinite lanes, it would help. But we have far less than that. We have so few that people make conscious decisions to either travel at different times or using other options like public transit.
You basically have a giant queue of people who are waiting for there to be one more lane before they’re going to start driving instead. As soon as that lane opens, they show up.
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