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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As with what others have said, I’ll also add that merging onto and off of the highway causes a lot of traffic. If you are in the fast lane and need to merge 8 lanes over to exit, you are far more likely to disturb the flow of traffic.
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