根據美國這個專門打車禍官司的律師網站指出, 車子背後被撞時氣囊不會爆, 除非從後面撞後又往前推超過20mph (32km/h)然後再撞上去氣囊才會爆. https://www.salinastriallaw.com/rear-end-car-collision-injuries/ Airbags usually deploy if a collision happens when you are traveling at more than 20 miles per hour. Even if you are stopped when you are rear-ended, if the force of the vehicle hitting you from behind brings your speed up to 20 miles per hour and that vehicle pushes you into another car or object, the airbags may deploy.