This happened quite a few years ago, maybe as long as 15 years. It’s definitely one of those “things could have gone so very, very badly and didn’t” stories.
I was driving on a highway in the city. Below is an aerial view of that section of road, labeled McAllister Freeway (former Mayor). In the picture, I was in the right lane driving north-ish, which would be from lower left to upper right. Six lanes in either direction on a curved road with no shoulders, only concrete sides. There is a concrete barrier down the center of this section of the highway. To make it more interesting, some structures on each side of the road hang over the road a bit. The feeling is very constricted, hemmed-in with no place to go, no place to pull over. A luge track comes to mind.
As I said, one day I was driving in heavy traffic. All three lanes were almost bumper-to-bumper, moving probably at 50 mph. Then along came some idiot in a sports car weaving in and out of traffic, being a show-off jerk. Suddenly the sports car clipped the back end of another car and both cars spun around out of control for a few very long seconds-- maybe 8-10 seconds? At least one of the cars turned completely around – 360 degrees. Miraculously, neither one of these cars hit any other cars.
But here’s the part I see as truly miraculous, and I think about it every time I drive that stretch of road, which I do often: as soon as the sports car made contact with the other car, causing a loud BANG, every other car in the vicinity immediately slowed to a crawl and stayed in its own lane. It was hive mind in action. Or a flock of birds. So much common sense and intelligent non-reactivity concentrated in one place at a moment when it really mattered. We just drove slowly and carefully, watching the two cars that had collided. Neither of them came completely to a stop either. It was surreal.
This could have been a 20-car pileup easily. Ambulances and other rescue vehicles would have had a devil of a time even getting to anyone. They probably would have had to close the entire section of highway and approach from the southbound side, hauling survivors and bodies over the median barrier. Maybe even using helicopters.
But instead, the two cars that had collided somehow got themselves pointed back in the proper direction in their proper lanes, and the rest of us just proceeded along, gradually increasing speed and going about our day. And drawing some very grateful breaths.