Segway PT x2 Reference Manual page 62

Table 5 shows the icons that display on the InfoKey Controller when
the Speed Limiter is engaged at a speed lower than the top speed set
by the InfoKey Controller. This table also describes the error that has
occurred and the recommended action you should take.
Table 5. Speed Limiter (Display Icon and Recommended Action)
Display Icon
50
Description
The Segway PT is
operating at
reduced
performance levels
due to a temporary
condition. The
speed limit has
been lowered until
the condition clears.
Recommended
Action
When the Speed
Limiter pushes the
Handlebar back,
stop leaning forward
and slow down.
Always leave a gap
between yourself
and the Handlebar.