Toyota 2010 Prius Owner's Manual page 144

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SRS airbag deployment conditions (front airbags)
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The SRS front airbag will deploy in the event of an impact that exceeds
the set threshold level (the level of force corresponding to a 12 - 18 mph
[20 - 30 km/h] frontal collision with a fixed wall that does not move or
deform).
However, this threshold velocity will be considerably higher if the vehicle
strikes an object, such as a parked vehicle or sign pole, which can move or
deform on impact, or if the vehicle is involved in an underride collision (e.g.
a collision in which the front of the vehicle "underrides", or goes under, the
bed of a truck, etc.).
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It is possible that in some collisions where the forward deceleration of the
vehicle is very close to the designed threshold level, the SRS front air-
bags and the seat belt pretensioners may not activate together.
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The SRS front passenger airbags will not activate, if there is no passen-
ger sitting in the front passenger seat. However, the front passenger air-
bag may deploy if luggage is put in the seat, or the seat belt is fastened,
even if the seat is unoccupied. (→P. 126)
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SRS airbag deployment conditions (side and curtain shield airbags)
The SRS side and curtain shield airbags will deploy in the event of an impact
that exceeds the set threshold level (the level of force corresponding to the
impact force produced by a 3300 lb. [1500 kg] vehicle colliding with the vehi-
cle cabin from a direction perpendicular to the vehicle orientation at a speed
of 12 - 18 mph [20 - 30 km/h]).
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1-8. Safety information
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