Kick and electric scooters https://www.wien.gv.at/english/transportation-urbanplanning/scooter.html
When driving a kick or electric scooter in Vienna, be aware of specific traffic rules that apply to them. Electric scooters up to 25 kilometres per hour and 600 watt have to observe the same traffic rules and regulations as a bicycle.
allowed in buses and trams but only if stowed in such a way that they do not pose any danger