Wearing an Apple Watch or using a new iPhone 14 can provide you and your loved ones with a sense of security that, in a severe car crash, help may find you even if you are unconscious.
However, any technology designed to sense the powerful forces involved in a car crash can be confused by the powerful forces at work on roller coasters. Clearly having emergency personnel responding to false alarms is not a good thing, so some amusement parks are already taking matters into their own hands:
It remains to be seen if Apple can solve this issue, although they may just ignore crashes detected at known amusement parks.
https://9to5mac.com/2022/10/09/roller-iphone-14-crash-detection-workaround/