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Could someone please explain why Transportation should be in Category:Travel? Travel is limited to the transport of people, and excludes half of the nature of transport—namely the movement of goods. At the same time travel is a type of transport. Because all travel is transport, but not all transport is travel, the Category:Travel should be in Category:Transportation, and not the other way around. Making Category:Transportation a subcategory of travel is just like making it a subcategory of Category:Rail transport—which I hope we all can agree would be incorrect. Arsenikk(talk) 20:13, 15 September 2008 (UTC)
As you note, half of transport is the transport of people. These people are using transport to further their goal of traveling. Traveling need not rely on transport- but transport facilitates it. The entire goal of transporting people is travel. Transport is a technology which enhances travel. Even in terms of goods, the ultimate goal is their movement from one location to another, which is facilitated by transportation. --EliyakT·C 08:02, 21 September 2008 (UTC)
I don't buy this. Please explain how travel can occur without transport (including human-powered transport). Travel remains a subsection of transport, since travel is merely a synonym to "transport of people". Perhaps think of it this way: Transport has three main elements—transport of people, transport of cargo and mode of transport. There is no category called transport of people, because that is covered in the category travel. Happy editing, Arsenikk(talk) 10:23, 21 September 2008 (UTC)
Perhaps one can say that all travel necessarily involves transport. However, the fact that the one cannot exist without the other does not indicate which is more fundamental. (Your argument can go both ways.) Conceptually, transport is an act that causes travel, and that is in fact its purpose.
Practically, though, Category:Travel deals only with the movement of people, while Category:Transportation deals with the (caused) movement of both people and goods. Even so, in terms of passenger transport, Category:Travel is the more fundamental one. A category does not need to be entirely encompassed in each of its parent categories. Rather, a "parent category" deals with a more fundamental concept which the subcategory elaborates on. The category structure thus has more general concepts towards the top and more specific ones towards the bottom. --EliyakT·C 01:24, 22 September 2008 (UTC)