If you have a serious disease and drive alone, it might not be worth it. I don't have a condition like that, but you can have a stroke or seizure no matter old you are. It was not comforting finding out the way they operate. If you press the SOS button but pass out before they answer they won't send help because they can't verify the call. The only exception I know of is if you crash the car and it sends an automatic signal. But I don't know if an airbag needs to deploy to do that. I also don't know if they send help if you are stopped in the middle of a road when you pass out. Too may ifs for me. I need to check with nearby county 911 dispatch people to see if they can triangulate or otherwise pinpoint my location if I call them. It seems you're better off not pulling off the highway if you don't feel well so someone will see if you're having a problem. Hopefully they wont jack you.