Traffic isn't a feature of cars it's a feature of the dumb apes steering the things. Don't take it personally, we're sure you are a superhuman navigator who breaks and accelerates seamlessly with the cars ahead of and behind you, but for every other human on the planet, the problem is reaction time, distractibility, and overcompensation when braking. Still, the science of how traffic jams occur is fascinating, and may help you stay calm the next time you're sitting on the highway and praying for the self-driving cars discussed at the end of the explainer:

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Sources: CGP Grey