Why motorbikes and vehicles have nothing in common

This article (Why motorbikes and vehicles have nothing in common) makes some great points. Especially the argument that motorcycles are not cheaper than cars when you factor in the cost of the funeral and cremation. The article also makes the obvious statement that both cars and motorcycles are viable forms of transport. However, that motorcycles are only treated as a hobby form of transport - at least in Britain and other Western, developed countries.

Why are motorcycles only a "hobby form of transport"? My answer is because they do not have safe infrastructure to travel on.