What Are Traffic Waves and Why Do They Happen So Much?

What Are Traffic Waves and Why Do They Happen So Much? | The Lowdown.

Nice overview of why spontaneous traffic jams occur, complete with simulation.

The simplest explanation for why traffic waves happen is that drivers have relatively slow reaction times: if the car in front of you suddenly slows down, it’ll likely take you a second or so to hit the brakes. The slower your reaction time, the harder you have to brake to compensate and keep a safe distance. The same goes for the car behind you, which has to brake even harder than you did in order to slow down faster. And so on down the road, in a domino-like effect.

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