<Tr> <Td> August 13, 1961 </Td> <Td> Trailways (terminal only) </Td> <Td_colspan="2"> Jackson, Mississippi </Td> <Td> </Td> <Td> </Td> </Tr> <P> In celebration of the 50th anniversary of the Freedom Rides, Oprah Winfrey invited all living Freedom Riders to join her TV program to celebrate their legacy . The episode aired on May 4, 2011 . </P> <P> On May 6--16, 2011, 40 college students from across the United States embarked on a bus ride from Washington, D.C. to New Orleans, retracing the original route of the Freedom Riders . The 2011 Student Freedom Ride, which was sponsored by PBS and American Experience, commemorated the 50th anniversary of the original Freedom Rides . Students met with civil rights leaders along the way and traveled with original Freedom Riders such as Ernest "Rip" Patton, Joan Mulholland, Bob Singleton, Helen Singleton, Jim Zwerg, and Charles Person . On May 16, 2011, PBS aired a documentary called Freedom Riders . </P> <P> On May 19--21, 2011, the Freedom Rides were commemorated in Montgomery, Alabama, at the new Freedom Ride museum in the old Greyhound Bus terminal, where some of the violence had taken place in 1961 . On May 22--26, 2011, the arrival of the Freedom Rides in Jackson, Mississippi was commemorated with a 50th Anniversary Reunion and Conference in the city . During commemorative events in February 2013 in Montgomery, Congressman John Lewis accepted the apologies of Chief Kevin Murphy of the Montgomery Police Department; Murphy gave Lewis his own badge, off his uniform, moving Lewis to tears . </P>

Who were the passengers that challenged segregation of interstate travel