Hill start assist warning light (MT models – if equipped)/Hill start assist OFF indicator light (STI)
Subaru Impreza / Subaru Impreza Owners Manual / Instruments and controls / Warning and indicator lights / Hill start assist warning light (MT models – if equipped)/Hill start assist
OFF indicator light (STI)

See also:
Brake booster
The brake booster uses engine manifold
vacuum to assist braking force. Do not
turn off the engine while driving because
that will turn off the brake booster, resulting
in poor braking power.
...
2011 Subaru Impreza WRX STi By Steven Cole Smith
Lost in the flashier news of the resurgence of Ford, General Motors and
Chrysler -- and the fast-rising profile of Hyundai and Kia -- is the story of
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Rear seats
WARNING
Seatbelts provide maximum restraint when the occupant sits well back and upright
in the seat. Do not put cushions or any other materials between occupants and seatbacks
or seat cushions ...
