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When Should an Air Bag Inflate?
The driver’s and right front passenger’s frontal air bags
are designed to inflate in moderate to severe frontal
or near-frontal crashes. But they are designed to inflate
only if the impact speed is above the system’s
designed “threshold level.”
If the front of your vehicle goes straight into a wall that
does not move or deform, the threshold level is about 9 to
15 mph (14 to 24 km/h). The threshold level can vary,
however, with specific vehicle design, so that it can be
somewhat above or below this range. If your vehicle
strikes something that will move or deform, such as a
parked car, the threshold level will be higher.
The driver’s and right front passenger’s frontal air bags
are not designed to inflate in rollovers, rear impacts,
or in many side impacts because inflation would not help
the occupant.
Side impact air bags are designed to inflate in moderate
to severe side crashes. A side impact air bag 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 air bags are
not designed to inflate in frontal or near-frontal impacts,
rollovers or rear impacts, because inflation would not
help the occupant. A side impact air bag will only deploy
on the side of the vehicle that is struck.
In any particular crash, no one can say whether an air
bag should have inflated simply because of the damage
to a vehicle or because of what the repair costs were.
For frontal air bags, inflation is determined by the angle
of the impact and how quickly the vehicle slows down
in frontal and near-frontal impacts. For side impact
air bags, inflation is determined by the location
and severity of the impact.
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