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There is no official notice. There are the regulations in place in CFR
Go and read 49 CFR Subtitle B Chapter II Part 238 Subpart C Section 238.203. The requirement has been loosened a lot and much greater leeway has been given to FRA to evaluate non-standard crash energy management systems to certify them compliant. IIt looks like the collision post requirements have also been revised, but I am not quite sure what the net effect is on car weight. I am told that it is easier to meet these requirements with smaller modification to off the shelf European designs.
Go and read 49 CFR Subtitle B Chapter II Part 238 Subpart C Section 238.203. The requirement has been loosened a lot and much greater leeway has been given to FRA to evaluate non-standard crash energy management systems to certify them compliant. IIt looks like the collision post requirements have also been revised, but I am not quite sure what the net effect is on car weight. I am told that it is easier to meet these requirements with smaller modification to off the shelf European designs.
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