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A bus that is not being tracked by a GPS-based bus information system (such as NextBus). This is generally because the driver failed to log the bus into the system.
For the opposite situation, see ghost bus.
It says 57 minutes until the next 7 bus, but the headway on this line is 40 minutes. I bet there's a stealth bus coming in 17 minutes!
by Urban_observer December 19, 2011