FMVSS (Federal Motor Vehicle Safety Standards) are prescriptive, not descriptive; they're also really really slow to update them. The difference between betwee

FMVSS (Federal Motor Vehicle Safety Standards) are prescriptive, not descriptive; they're also really really slow to update them. The difference between between FMVSS and UN/EU regulations could also be considered a regulatory moat. In today's globalized world, I can't imagine that the moat is worth it anymore. (Disclaimer, I work for General Motors, this is strictly my own opinion)