They literally are substitutes. If planes didn’t exist then more people would ride motorcycles for very long distances. They may even take their motorcycles on ferries to make their trips possible if they have to.
No, clearly not. But I’ve already explained how they are substitutes and you just ignored my point.
Not that they need to be substitutes in the first place. Any mode of transportation is going to be more or less dangerous than any other mode of transportation, and that alone is enough to compare them. You don’t need to be able to literally substitute a plane for a motorcycle in every situation to analyze the differences in the danger between them.
They literally are substitutes. If planes didn’t exist then more people would ride motorcycles for very long distances. They may even take their motorcycles on ferries to make their trips possible if they have to.
You gonna bike across an ocean? You gonna take an airplane to the grocery store?
None of the other listed modes of transportation would be used to cross the ocean (depending on how generous you want to be with “ferry”).
But for domestic travel, no planes would mean more trips by automobile. And inevitably, some of this would translate to more motorcycles.
Pick your destination, now ignore all forms of transport that are obviously unsuitable. Now off you go.
Should include walking/cycling but health benefits are harder to factor in as I am pretty sure the risk of death is lower than the health benefits.
No, clearly not. But I’ve already explained how they are substitutes and you just ignored my point.
Not that they need to be substitutes in the first place. Any mode of transportation is going to be more or less dangerous than any other mode of transportation, and that alone is enough to compare them. You don’t need to be able to literally substitute a plane for a motorcycle in every situation to analyze the differences in the danger between them.