There’s something called induced demand, which means when you add more lanes, more people end up driving. For example, a study by the University of California, Davis found that increasing highway capacity by 10% can lead to almost the same increase in traffic within a few years. So traffic just goes back to being bad again.
Also, highway expansions are really expensive. The American Association of State Highway and Transportation Officials reports that building just one mile of urban highway can cost millions of dollars. That money could go to things like public transportation, which helps more people and reduces traffic long-term.
On top of that, more highways mean more pollution. According to the Environmental Protection Agency, transportation is one of the biggest sources of greenhouse gas emissions in the U.S. Expanding highways just makes that worse instead of solving the problem.
So overall, banning highway expansions could push cities to invest in better solutions that actually reduce traffic and pollution instead of making them worse.
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