C-1 is the primary route between West and East Campuses (Monday through Wednesday: 7:00 a.m. - 2:00 a.m., Thursday through Friday; 7:00 a.m. - 4:00 a.m, Saturday: 8:15 a.m. - 4:00 a.m., Sunday; 8:15 a.m. - 1:00 a.m.).
Visit this page for details: http://parking.duke.edu/buses_vans/bus_sched/C1_East_West.php
For general information call the Duke University telephone operator at (919) 684-8111