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I guess another place to look for information on size and weight vs safety is the race car industry.
Indy cars are VERY small and light! Of course the biggest part of that is so they have great acceleration, but it is also a HUGE concern for safety.
It is amazing the speeds at which these cars can hit a wall, and still have the driver walk away alive. (You bet they wear their seatbelts!)
The cars are light and also DESIGNED to break into smaller pieces, thus quickly loosing mass, thus momentum. IE-they break into little pieces to slow down really fast.
I'm not saying that Ford or GM is going to design cars that almost explode on impact like that, but why not take a cue from the racing industry about how light weight is safe.
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