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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To add another wrinkle to this: every lane you add to a road adds less and less overall capacity to the road.
For example, adding a lane to a single lane road, going from one to two, effectively doubles the capacity of the road. But, going from two to three doesn’t do the same. Instead you have only increased the capacity 1.5x. Going from three to four is 1.3x. Four to five is 1.25x. Each time the capacity increase gets smaller and smaller.
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