B-
Not Very Efficient
To its credit, Miami is a small campus in a small town, it probably doesn't need public transport that bad. The time it takes to walk somewhere on campus is probably the time it takes you to wait for a bus to come and transport you. Still, it makes that difference look even worse.
There is a bus that runs off campus to the local Kroger, and some special bus services that take occasional trips to Walmart (farther away), as well as some nighttime services, which can be picky about who they pick up. There are also emergency phones located across campus for emergency pickups.