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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8 lanes won’t help if all the cars are going to the same place downtown where it gets narrowed into streets.
There is also the idea of induced demand. When you add more free roads, new people that were not commuting will consider using this new infrastructure. Basically, if you put so much money in car infrastructure, don’t be surprised when people choose cars over other means of transportation.
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