Subaru BRZ 2018 Owner's Manual page 122

1-7. Safety information
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Examples of the types of accidents in which the SRS side airbag is
unlikely to deploy
There are many types of collisions which might not necessarily require SRS
side airbag deployment. In the event of an accident like those illustrated, the
SRS side airbag may not deploy depending on the level of accident force
involved.
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The vehicle strikes a telephone pole or
similar object.
The vehicle is involved in a side-on
impact from a motorcycle.
The vehicle rolls onto its side or roof.