In most states a 3 wheeled vehicle is classed as a motorcycle, for which a crush-proof frame/body is not required. I have not been able to find any "standards" that apply. Someone built a new California Commuter last year and registered it in Florida for use on the highways. If it has 4 wheels it's a car and needs to meet all the FMVSafetyStandards, if it has 3 wheels it's a motorcycle and there are very few standards - applying to brakes, lights, etc. - NOT to frame.
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