Toyota PRIUS 2008 Manual page 92

1-8. Safety information
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Operating conditions (front airbags)
The SRS front airbags will deploy if the severity of the frontal impact is
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above the designed threshold level, comparable to an approximate 15
mph (25 km/h) collision, when the vehicle impacts straight into a fixed
barrier 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.).
It is possible that in some collisions where the forward deceleration of the
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vehicle is very close to the designed threshold level, the SRS front air-
bags and the seat belt pretensioners may not activate together.
The SRS front passenger airbags will not activate, if there is no passen-
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ger sitting in the front passenger seat. However, the front passenger air-
bag may deploy, if heavy luggage is put, even if the seat is unoccupied.
(P. 101)
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Operating conditions (side and curtain shield airbags [if equipped])
The SRS side airbags and curtain shield airbags are designed to inflate
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when the passenger compartment is subjected to a severe impact from
the side.
The SRS front side airbag on the passenger seat will not activate, if there
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is no passenger sitting in the front passenger seat. However, the front
side airbag on the passenger seat may deploy, if heavy luggage is put,
even if the seat is unoccupied. (P. 101)
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