You’re waiting for a bus. You wait, and then you wait some more. Finally, two or three buses show up at once, all headed for the same destination. Public transportation professionals have a term for this — several, in fact: bus bunching...
skylab n.— «The sole means of public transport is a motorcycle service, which someone with a curious sense of humor dubbed “the Skylab.” Skylabs appear a few times a day. Up to five people, including women holding infants...
bunching n.— «Adding more street supervisors might help with bus “bunching,” the term for buses traveling in herds and disregarding the schedule.» —“Funds Sought to Hire More Drivers, Increase Service on In-Demand...