The story
Athens Transit and UGA Campus Transit buses were part of an early trial of biodiesel fuel during the 1996 Olympics.
Athens Transit was formerly known as "The Bus" but in 2018 it was changed to its current branding as "Athens-Clarke County Transit" as it was one of the few remaining A-CC services that did not refer to "Athens-Clarke" in its name.
From Wikipedia’s article on Athens Transit, shared under CC BY-SA 4.0.4