When Should an Airbag Inflate?
The driver’s and right front passenger’s frontal airbags
are designed to inflate in moderate to severe frontal
or near-frontal crashes. But they are designed to inflate
only if the impact exceeds a predetermined deployment
threshold. Deployment thresholds take into account
a variety of desired deployment and non-deployment
events and are used to predict how severe a crash
is likely to be in time for the airbags to inflate and help
restrain the occupants. Whether your frontal airbags
will or should deploy is not based on how fast your
vehicle is traveling. It depends largely on what you hit,
the direction of the impact and how quickly your
vehicle slows down.
If the front of your vehicle goes straight into a wal
that does not move or deform, the threshold level is
about 9 to 14 mph (14 to 23 km/h). (The threshold level
can vary, however, with specific vehicle design, so
that it can be somewhat above or below this range.)
Airbags may inflate at different crash speeds. For
example:
• If the vehicle hits a stationary object, the airbag
could inflate at a different crash speed than if
the object were moving.
• If the object deforms, the airbag could inflate at a
different crash speed than if the object does not
deform.
• If the vehicle hits a narrow object (like a pole) the
airbag could inflate at a different crash speed
than if the vehicle hits a wide object (like a wall).
• If the vehicle goes into an object at an angle the
airbag could inflate at a different crash speed
than if the vehicle goes straight into the object.
The frontal airbags (driver and right front passenger)
are not intended to inflate during vehicle rollovers, rear
impacts, or in many side impacts because inflation
would not likely help the occupants.
Side impact airbags are designed to inflate in moderate
to severe side crashes. A side impact airbag will
inflate if the crash severity is above the system’s
designed “threshold level.” The threshold level can vary
with specific vehicle design. Side impact airbags are
not designed to inflate in frontal or near-frontal impacts,
rollovers or rear impacts, because inflation would not
likely help the occupant. A side impact airbag will
only deploy on the side of the vehicle that is struck.
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