Toyota Prius 2011 Manual page 120

1-8. Safety information
Conditions under which the SRS airbags may deploy (inflate), other
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than a collision
The SRS front airbags may also deploy if a serious impact occurs to the
underside of your vehicle. Some examples are shown in the illustration.
Types of collisions that may not deploy the SRS airbag (front airbags)
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The SRS front airbags are generally not designed to inflate if the vehicle is
involved in a side or rear collision, if it rolls over, or if it is involved in a low-
speed frontal collision. But, whenever a collision of any type causes suffi-
cient forward deceleration of the vehicle, deployment of the SRS front air-
bags may occur.
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Hitting a curb, edge of pavement or
hard surface
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Falling into or jumping over a deep hole
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Landing hard or vehicle falling
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Collision from the side
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Collision from the rear
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Vehicle rollover