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At major universities, such as Ohio State, it is appropriate that students be assessed a separate fee to cover the expenses of the variety of services and amenities that are provided to the student community. This would include student activities, membership in recreational sports facilities AND provision of some form of campus transportation system (usually buses) that helps them get around a large campus, to/from off-campus housing and apartment complexes that cater to students, and perhaps a shuttle to local shopping/business districts.
That said, it is NOT appropriate to divert student fees into the local mass transportation system that provides service to the entire community, especially in a major city like Columbus where the population (500K+) is substantially larger than the university community.