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This is largely a matter of regulations in the target market. However, in the US an airbag should deploy in a head-on collision with a fixed barrier at approximately 14mph, or with a parked car at roughly twice that speed.

Actual deployment is really dependent on acceleration, and in collisions that don't meet these conditions the speed of the vehicle may be significantly different. Further, manufacturers are refining algorithms that control deployment and speed of inflation to account for such factors as seat-belt use, weight of occupant, etc. These will also affect the actual speed at which an airbag deploys.

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Q: How fast does a vehicle need to be moving for the air bags to deploy?
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