Power-assisted bicycles
Power-assisted bicycles in Australia are 'push bikes' fitted with an a motor
not exceeding 200W capacity. This is quite low and people are lobbying to
have this raised.
The limit in New Zealand is 300W. See
http://nzta.govt.nz/vehicle/your/low-powered.html [1]
See also http://en.wikipedia.org/wiki/Electric_bike
[1] http://nzta.govt.nz/vehicle/your/low-powered.html