one shouldn't*
replyOne shouldn't add new safety standards*
writing before coffee...
To be fair, some municipalities do actually require old cars to be fitted with seatbelts... air bags, not so much, because apparently changing a steering column is too hard?
replyWell, I just noticed I said 'should' and not 'shouldn't' which I wanted to say
replyBut to your point,
While they might not be required to retrofit, one shouldn't stop defining new safety standards.