Segway PT i2 Getting Started Manual page 61

When a Safety Shutdown occurs, the Segway PT automatically
reduces its speed, gives the Stick Shake Warning (shakes the
Handlebar and makes growling noises), flashes the Balance Indicator
lights, emits a warning tone, and the InfoKey Controller displays an
unhappy face.
You have approximately 10 seconds from the start of a Safety
Shutdown to come to a controlled stop and step off. After 10 seconds,
the Segway PT will immediately shut down when the Wheels reach
zero speed.
If a Safety Shutdown occurs:
1. Immediately come to a controlled stop.
2. Carefully step off one foot at a time.
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