A closer car analogy: antique vehicles without seatbelts were not banned from public roads when seatbelts became mandatory.

Except that it's already been decided the towers will be removed, which is counter to your example. My analogy was meant to highlight the delay in action against something that has been deemed a risk.

Almost every safety regulation does this; few are effective immediately. Manufacturing plants need retooled, workforces need retrained, new equipment needs to be acquired and implemented, compliance measure must be implemented, etc.

>Except that it's already been decided the towers will be removed, which is counter to your example.

Grandfather clauses are implementation grace periods that are equal to the expected lifetime of the device. This is not counter to the example -- this is an example that sometimes these grace periods are very generous even for things we are very sure are unsafe.

No because buckling my seatbelt at the start is free and easy.