Public transportation throughout SLO is provided by SLO Transit and is subsidized by the University (which makes it free to students). Buses can be crowded at times, and they generally run twice per hour. This makes them less than ideal for students who maintain a tight schedule. It can be stressful when the bus is a minute or two late and full when it pulls up.
Another option for transportation late at night (home from campus) is the Escort Van Service. There's a van that will drive students home for free from the University Union or library in between 7 p.m. and midnight, which is perfect for students who might walk to school in the morning and need a safe ride home at night. There are multiple taxi companies and also a company called SLO Safe Ride. Both are able to drive people around San Luis Obispo, particularly downtown for a night on the town. Zipcar is also present on campus for students without a car.