In SA, as well as WA, NT, and Qld, you can ride a 50cc scooter on a car licence. In every state except WA (I think), that 50cc scooter is limited to 50km/hr top speed. In WA it's limited to 60 instead. Some scooter riders think they don't need proper protective clothing - just like leather vest/T-shirt/ordinary jeans wearing Harley riders, and those sport bike riders I've seen in singlet and thongs; even Croc shoes! It's their skin, so it's up to them. They obviously trust car drivers more than I do. I'm not their mother, so I don't give a shit.