eli5 How does traffic work?

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Interstate traffic. Highways are so full of traffic lights and sharp turns so I get that. But how does traffic work on an interstate? Every turn is designed so you don’t have to stop. Every merge is seamless.

Yet SOMEHOW every road-trip runs into the whole thing being in a complete standstill. How does that work? What does the front of that look like? What’s happening?

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5 Answers

Anonymous 0 Comments

Every time some inconsiderate asshole cuts someone off because they are impatient, it creates an exponential slowdown. Think about a formation marching, if 1 person gets a little behind and has to run to catch up it creates a gap slightly wider the next person has to catch up. Until you get to the end of the formation and the last guy has to run 15 feet to make up for the 1 foot a guy fell behind.

This same principle applies to traffic, anytime someone has to hit the brakes the next people have to deal with exponential slowing until you end up with bumper to bumper traffic.

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