>>> Crash Detection is also available on Apple's latest iPhone 14, iPhone 14 Plus, iPhone 14 Pro, and iPhone 14 Pro Max. Some reports suggest that the technology still requires work, with Apple already asking for feedback. But there's no doubt it worked exactly as advertised for this lucky man.<<<
Crash Detection “technology still requires work” will remain the case likely for a long time. There’s numerous variables within varying crashes (not just automobile). Then couple that with Apple can’t have it trigger it too easily (too many false 911 calls).
The sound of an airbag deploying seems like it would be a semi-universal noise, one that the iPhone or watch could be sensitive too.