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

There’s a phenomenon in traffic flow, present even when the road is clear called concertina, where drivers continually over and under adjust to the distance they perceive themselves to be from the vehicle in front. Add to this the distraction provided by GPS, passenger interaction, driver fatigue and so on and you end up with basically a body of traffic that is in a continual act of over or under reaction. Then add to this the frequent merge lanes and exits and you are now in the situation where you are stopped for no good reason and somebody better be bloody dead up there, but they aren’t. The only thing that died today was your hope of a quick dart down the 401 to that boat place that’s been on TV.

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