How does traffic flow slow down with no obvious reason?

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Ok let me try and make this make sense; when driving on the motorway/highway, why does traffic come to a slow or stop at some points and then speed up (with no obstructions/traffic lights etc) and flow freely with no change in the road or conditions?

If it’s clear up ahead, why do cars slow down or stop when nothing is blocking them in the distance? It’s like it slows down for no reason then just regains speed and traffic flows fine. Drives me insane

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23 Answers

Anonymous 0 Comments

Think of traffic like a slinkie. All together, it’s moving forward. No problem, then boom, the front stops for whatever reason, and the rest pile into it. Well, the back end doesn’t notice it because it’s so far away it hasn’t come up to the problem. The front has dealt with it and moved on before the back has had a chance to even see it, but the middle is dealing with it currently. So, while that obstruction is gone, the “momentum” of traffic gets slowed.

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