Despite policies meant to encourage alternatives to cars, traffic in cities has actually increased faster than population.
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From 1990 to 2015, the metropolitan population has gone up some 30 percent while urban interstate lane miles have increased 68 percent, according to a new report, and accompanying webinar, from SSTI and the Mayors Innovation Project.
https://mobilitylab.org/2018/11/19/traffic-prediction-standard-level-of-service/