Sometimes you'll be on a bus and you'll get a message that it has to wait for a short time at a stop (no more than 2 minutes usually), to even out the service.

Sometimes you'll be on a bus and you'll get a message that it has to wait for a short time at a stop (no more than 2 minutes usually), to even out the service. This is when it's getting too close to the bus in front, so it backs off to retain an even distribution of busses.