I took the bus in Pittsburgh PA for many years. I'd often show up 10 minutes before the scheduled arrival time and quite commonly the busses were 20-30 minutes

I took the bus in Pittsburgh PA for many years. I'd often show up 10 minutes before the scheduled arrival time and quite commonly the busses were 20-30 minutes late... or didn't come. Or came by, but didn't stop. Waiting for 30 minutes seemed about the average.