The collection of ConstructionArtifacts whose primaryFunction is to provide for a ChangeOfConveyance of goods or people. Examples include: a PortFacility where cargo is loaded and unloaded from ships, an airport terminal where people are changing planes or changing from planes to other forms of transportation. Negative examples include bus stops, where most people probably just walk to the bus (though some transit centers may be marginal positive examples). A borderline case is subway stations where two or more lines meet; many passengers may be changing from one conveyance to another but many may just be walking there