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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Once a road gets congested enough that you’re considering expanding it, people have already sought out alternative routes (or changed their driving patterns) because the traffic on that original route was so bad. When you go in and add lanes to that road, you encourage that traffic to return because now there’s more capacity, and the road fills right back up.
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