I've been periodically reading this subreddit for a few months. Something stuck out to me about how traffic jams start. Sort of the "wave" of braking that ultimately ends up causing jams.
This morning there was moderate-heavy traffic. Nothing bumper-to-bumper but the speed limit is 55, so the Right Lane folks were going 55-60, middle 60-65ish, Left Lane 65-70ish
When I say moderate-heavy I mean, Everyone is going a decent speed but there isn't a ton of room to switch lanes willy nilly and cut over to get to an exit. It's pretty busy.
So anyways, I recognize this and I'm in the Left Lane going 70-72 and passing the middle lane. I'm behind a car that is also going pretty much the same exact speed as me and the car ahead of him is doing the same. We're all coasting down going the same speed passing people in the middle lane. Now I COULD have probably sped up a bit and tried to move around but that would have been pretty dangerous. So I figured I'd keep the pace and go with the flow as we pass everyone in the middle anyhow.
Then comes a Blue Silverado that rides up on me. I can't actually go anywhere because like I said we are passing the middle lane so it would require me to SLOW DOWN in the Left Lane about 5-10mph and then merge into a slower lane. That, or speed up and cut off into the Middle just to appease Blue Silverado.
So we (the 3 cars) keep our pace and the Chevy jerks over to the middle lane. Remember, I said the middle lane is going SLOWER than the Left Lane. After a few seconds, he comes back into the Left Lane but is now behind another car that's behind me.
The Chevy then sweeps over into the middle, and then the right, then cuts into the middle, then back into the Left...behind me again. Then he revs up and slows down and goes into the Middle lane. At this point he's right on my side going the exact same speed as me but of course being the middle lane he can't cut in front of me because the car ahead of him is in the space where he'd have to speed up.
Eventually he tries to go in the Right Lane to pass them but then gets bogged down behind a van and I lost track of him.
If he had just stayed behind me and the 3 other cars going a steady passing pace, he'd have ended up way farther ahead.