I think the changes came about because almost every moped and scooter you buy nowadays goes faster that 30 and cities and towns cant properly ticket a moped here cause they done issue plates in Mass, only registration stickers with a serial number. And no metermaid / cop wants to look up a vehicle by that number, its too small. the sticker is a 1 in squre. Plus most moped riders i see dont have the registration sticker and the cops here (Metro Boston) could care less.