[scarface74]

a) Other motorists are expecting it and paying attention and

In jurisdictions where it is illegal, why should a motorist any more “expect it” than they should expect a car to do any other illegal behavior? Of course safe driving 101, is that certain common behaviors you should expect.

[theboulevardier]

Well, if it is illegal that is another thing entirely. But where I live, it is legal and basically every motorcyclist does it.

[scarface74]

From what so can tell, it is illegal in Canada - the article is on a Canadian website.