alt Hacker NewsAdding lanes may not cut congestion in the long term, but it can increase throughput and overall utility by moving more people and goods.
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ronbenton • yesterday at 9:07 PM
I don't doubt it. It is quite a while ago so I don't fully recall the talk that my professor gave, but I don't believe he intended to mean adding lanes was useless, just that they didn't help with congestion of the particular roadway
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Each additional lane has less and less impact because of lane switching. Ultimately, you can still only enter or exit on the left or right, regardless of if you have 100 lanes. And having people move across 100 lanes to exit is much slower than moving across one or two.