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...
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...