Airbag compliant means that the bar will allow the airbag sensors to trigger. Some that are attached to crush structures or the chassis may not transmit the correct deceleration which may result in deployment when it was not necessary, or not at all. Both are undesirable.
There are accelerometers that measure the rate of deceleration that then cause the airbags to deploy. There are similar sensors in the doors to detect side intrusion for curtain airbags.
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