My point
(As also made by benzyl, below) is that the law views bicycles, tricycles and quadricycles identically, and views them as a separate group from motor vehicles. Some of the same laws apply in that a cyclist is propelling a something on the highway, but my point is:

In law, cycles and motorised vehicles are treated differently.

In law, it doesn't matter how many wheels it has. It's all the same.
( MatJ LOOK, Thu 23 May 2013, 3:59, Reply)