Subaru 2015 Forester Owner's Manual page 89

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Seat, seatbelt and SRS airbags/*SRS airbag (Supplemental Restraint System airbag)
Examples of the types of accidents in which the SRS curtain airbag will most
likely deploy.
1) The vehicle is involved in a severe side
impact near the front seat or the rear
seat.
2) The vehicle rolls onto its side or the roof.
3) The angle of vehicle tip-up is marginal or
the skidding vehicle s tires hit a curb-
stone laterally.
4) An offset frontal collision that is severe
enough to deploy the front airbag.