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 build it, they will come.
Austin built massive amounts of roads. They migrated traffic, so housing developers came along and built out a lot more housing. And those new people drive, so you are back at where you started.
They were successful in getting rents down in the cycle, but the excess road capacity ended up being used.
For most the US, mass transit is sufficiently low that it rounds to zero, and the big drivers in induced demand ends up being housing construction.
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