Subaru 2012 Forester Owner's Manual page 161

! Examples of the types of accidents in which the SRS curtain airbag will most
likely deploy.
Seat, seatbelt and SRS airbags
1) A severe side impact near the front seat
or the rear seat activates the SRS curtain
airbag.
2) The vehicle rolls onto its side or the roof.
3) If the angle of vehicle tip-up is marginal
or if the skidding vehicle's tires hit a
curbstone laterally.
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