David_Gerard comments on Avoiding the emergency room - Less Wrong
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I'm pretty sure "driving the largest car you can afford" is a textbook case of everyone defecting in a prisoners' dilemma. A collision between two light cars is better than a collision between two heavy cars, but since the most disastrous outcome is to be in a light car colliding with a heavy car, everyone chooses the heavy car.
ETA: The above is wrong; see link in grandchild.
No. Look at crash test data: big cars have more room to crumple, so the dummy is considerably less damaged.