MOTOR-SCOOTER
i think you want a MOTOR-SCOOTER, not a "mototorized scooter". i would say that the safest (and probably one of the best overall) is the BMW-C1. the rider sits inside a protective shell, and also wears an across the the chest (racing style) seat belt. they are quite popular in europe, but they certainly are also expensive - well, after all, they are a BIMMER ! the C1 has been tested in canada and BMW is waiting for approval from the authorities so that they can start selling. i understand that the price is to be in the $6,000 range; so it is not exactly cheap transportation. you can find details here >>>
BMW-C1 ... i used to drive a little 100cc motorcycle by the name of IMME (bumble-bee) in germany. sure was fun ! (didn't even wear a safety-helmet in those days - had not been invented yet, i think ! ). hbg