Care has to be taken when dealing with car accidents where airbags are fitted. The problem is that you may be helping a patient in a car, supporting their head and then airbag suddenly fires. This can cause the rescuer serious injury as well as putting the patient at risk.
If you attend a car accident, check to see if the airbag has activated and if not then take care not to be in the area where it could fire. If you are needing to support their head consider going in from behind the driver. Air bags are not just in the front, many cars have side and rear airbags. All of these should be approached with care and with good communication to the patient to ensure that the spine is protected.