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A comment on Phantom traffic jams, and why lane expansion isn’t really successful. Parent comment

Re:Phantom traffic jams, and why lane expansion isn’t really... by 1123581321 on Monday July 02, 2018 @02:36AM (#17439712)
About two years. I agree it should continue to increase over the next several years as homes and businesses are located with the wider highway in mind. However, if latent demand takes too long to manifest, the lane expansion has saved driving time for a significant fraction of its life and shouldn’t be thought of as ineffective.
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Re:Phantom traffic jams, and why lane expansion isn’t really... by TheCoelacanth on Monday July 02, 2018 @10:35AM (#17441960)
Adding a lane to an urban highway is immense. There is not only the cost of building the actual road, but the cost of acquiring the land which often requires displacing people from their homes via eminent domain and the cost of the disruption caused by the construction.

Just providing some benefit is not enough to justify the cost; it must provide an enormous benefit.

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