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Those cars are impressive. My first thought watching it was "Woah, how are they going to keep from ramming each other like bumper cars?"
A mere few moments passed and the answer was "Oh. They aren't. They're just going to ram each other like bumper cars!"
There's some pretty heavy hits in there, too. Some probably exceeding 20 MPH in total relative speed. Do that in any normal econobox and you're just left with lots of brightly colored plastic shards that cost a gazillion bucks to replace.