Road deaths are these days 1/4 of what they were at their peak and there are an awful lot more miles traveled these days. So cars are a lot safer through many many contributing factors. I wonder what impact air bags have had on the safety?
Obviously the integrity of a lot of those safety features are checked at WOF/MOT time - such as seat belt operation, brakes and their assisted operations etc.
As we do not replace the airbag components at their recommended service intervals, I suppose we are accepting that we are prepared to accept a historic level of safety - you could say we're going back to 1990 levels when there were 2 1/2 times the current deaths - but then other things like ABS and general structure improvements have also been introduced since then.