(c) "bicycle" means
(i) a vehicle propelled by human power upon which or in which a person may ride and that has two tandem wheels either of which is 350 millimetres or more in diameter or that has four wheels any two of which are 350 millimetres or more in diameter but does not include a wheelchair, or
(ii) a vehicle propelled by human and mechanical power that is fitted with pedals that are operable at all times to propel the bicycle, that has the same wheel requirements as set out in subclause (i) and that has an attached motor driven by electricity not producing more than 500 watts or with a piston displacement of not more than 50 cubic centimetres and is incapable of providing further assistance when the vehicle attains a speed of thirty kilometres per hour on level ground;