I have had a couple instances of ventricular fibrillation. I have an implant which brings me back to life when that happens; I would be dead without it. However, I do go unconscious for a few seconds until I get shocked back to life.
Although my case is infrequent enough that it is not thought of as a risk by the medical community, for peace of mind what I would really like to have is a link between a watch of some sort and a car capable of self driving. Should I be driving when I go unconscious, all the car would need to do is automatically kick in autopilot mode while gradually slowing down, until a heart rhythm is detected again.
The risk is small, if you consider the percentage of time I'm behind the wheel, but it would be good for peace of mind. It would also be helpful for others who do not yet know they have a heart condition, or those who are having a stroke or epileptic attack while at the wheel. There are others with worse conditions than mine who are basically advised not to drive, so it would help them as well.
If falling asleep can be detected by any biological signals, that would also be a useful autopilot trigger while waking the driver up, for the general population.
Currently most cars require manually activating the autopilot mode; what I'm proposing is a vital sign monitor to automatically begin self-driving if the human is incapacitated.
If the human doesn't wake up within a half a minute or so, the car could also self-drive itself to a hospital. I think we're far enough with self-driving tech that that saved life would far outweigh the risks of the self-driving system having any issues en route.