I dimly seem to remember that there might be differing strategies in place in some parts of the world (maybe something like US vs. Europe?): In some places seat

I dimly seem to remember that there might be differing strategies in place in some parts of the world (maybe something like US vs. Europe?): In some places seatbelts aren't assumed in determining the airbag timings, whereas elsewhere the timing and triggering level are optimised based on the assumption that seatbelts are being used.