In the course of an investigation of an auto accident in Texas , an expert accident reconstructionist makes mathematical calculations that revolve around a physics concept : the Delta V. The Delta V represents velocity change. To illustrate, imagine your car strikes another object and decelerates from 35 mph to 25 mph. The Delta V is 10 mph.
Air bags generally do not deploy in auto accidents where the Delta V is 14 mph or less. The common misperception is that the air bags should deploy when the vehicle crashes into another object that moves after impact, causing people to believe the Delta V is not great enough to trigger air bag deployment.
In addition, if your vehicle or SUV is involved in a rollover, do not expect the air bag to open. Air bags open and deflate in a fraction of a second – their main function is to protect on the initial impact but they do not provide continuous protection.