If the law starts now, in 5-10 years the vast majority of old cars will be junked. Sure, there will still be a few old cars, but they will be an insignificant m

If the law starts now, in 5-10 years the vast majority of old cars will be junked. Sure, there will still be a few old cars, but they will be an insignificant minority. It's not unlike how other rule introductions worked. Nobody banned old cars without seatbelts, they just required that all new cars have them.