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Building Bigger Roads Actually Makes Traffic Worse - Wired

By Adam Mann


The concept is called induced demand, which is economist-speak for when increasing the supply of something (like roads) makes people want that thing even more. Though some traffic engineers made note of this phenomenon at least as early as the 1960s, it is only in recent years that social scientists have collected enough data to show how this happens pretty much every time we build new roads.


I GREW UP in Los Angeles, the city by the freeway by the sea. And if there’s one thing I’ve known ever since I could sit up in my car seat, it’s that you should expect to run into traffic at any point of the day. Yes, commute hours are the worst, but I’ve run into dead-stop bumper-to-bumper cars on the 405 at 2 a.m.


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