Final answer:
The double deck buses running in Davis are connected to the Civil Rights Movement and the protests against segregation on city buses.
Step-by-step explanation:
The story behind the double deck buses running in Davis is related to the Civil Rights Movement in the United States. In the mid-20th century, many Southern bus systems required black patrons to follow a humiliating daily ritual of entering through the front, paying the fare to the white driver, and then exiting the bus to enter back through the rear. This segregation on city buses led to protests and demonstrations, including the famous Freedom Rides, where activists challenged these discriminatory practices.