Transportation costs

Why do some schools include transportation costs in their list of indirect costs? If the live on campus

Traveling to and from campus to home. Most modes of travel cost something.

In addition, students will typically need to go places from time to time, and transportation will cost money. They may need to get groceries or toiletries, go to the doctor, buy clothes, etc. While these things can be ordered & delivered, that is not the expectation.