The people at the front are morons and probably in the wrong lane.
this post was submitted on 28 Aug 2025
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CGP grey did a video on it: https://www.youtube.com/watch?v=iHzzSao6ypE
Basically one car breaking too much will make the following brake even more and so on until one stops and there's a jam. There is no clear reason like a road blockage or an accident, just compounding slow down.
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(2 replies)
It's usually a complex crowd effect created by many participants trying to maneuver among each other in slightly disperate ways.
In Portland OR, it really is because some dingbat slowed down to 20 MPH on the interstate for literally no fucking reason at all.
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(4 replies)
You are thr traffic.
They called it "ghost jam" but man, i prefer blackberry jam.
Too many seeds. I’m more of a jam band kinda guy.
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(1 replies)
Its because of two things. One is that people hog the passing lane or try to pass slowly so it takes them a few minutes to overtake a few cars, and also because people drive at different speeds. Some people drive at the speed that feels comfortable, others drive the state imposed speed limit. This creates pockets of dense traffic, and then people try to pass, but there is always the person who tries to pass as slow as possible because they are going a few mph over the speed limit.
Its really just a bad combination of laws, and drivers who are terrified of breaking the law, and people who dont know how to drive correctly in a way to reduce traffic. Also many people are just never consider that others also need to use the roads. They don't care about traffic. Some people also have health issues, like blindness, or mental handicaps, which means driving at interstate speeds is about all they can muster.
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(1 replies)
https://www.mdpi.com/2076-3417/11/9/4278
TLDR: modeling traffic as a gas leads to fairly accurate predictions. If that doesnt mean anything to you, here's a decent visualization of how gasses move around in a system. In this analogy, each of the gas particles models a car on the road. https://youtu.be/Hr5Baj3lXFA
Years ago I was in LA on business and ended up on I-5. All of a sudden traffic stopped dead. Eventually people were getting out of their cars and walking around. About a half-hour later, traffic started up again. We never saw what was responsible for the blockage. No wreckage, no obvious marks or debris on the pavement, nothing. I'm glad I live in a small city nowhere near California.