go to universityIn 大学に行っている, it usually means “attend university” or “be in university,” rather than simply being on the way there. The て-form can also connect to a following verb, as in 大学に行って勉強する (go to university and study).
JA: 妹は来年、東京の大学に行っていると思います。
EN: I think my younger sister will be attending a university in Tokyo next year.