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by therein 493 days ago
In the Bay area, what I noticed is, unnecessary clumps almost always get nucleated by a Tesla going lower than the speed limit on the left lane and then a tall vehicle behind them.

The tall vehicle behind the Tesla will hide the fact that the slow Tesla on the left lane is slow for no reason, people behind the tall vehicle will think there is traffic. And we will all go 55 on the left lane, thinking there is traffic. Until some incline allows people to see that there is no real traffic and then the Tesla gets overtaken and clump is broken.