Originally Posted by
Gresp15C
Perhaps a simple idea would be some variant on the "dead man switch." There have been various mechanisms in use on rail locomotives, in case the engineer drops dead while the train is running. They have to activate some kind of sensor every few minutes, or the train stops. There are similar controls on some kinds of heavy industrial machinery to prevent accidental activation. Detecting the absence of a basic signal after a certain time duration would seem easier than trying to interpret the data from a bunch of force sensors.
Uh, that would require paying attention to something, when and while you are trying to pay attention to "driving" and are NOT on rails, as in the example you mentioned.
The accelerometers in a phone should be good enough to determine some sort of "event" has occurred... couple that with a "dead man" request for response, which if not met in a certain period, then results in the alarm being sounded and texting action being triggered.