You can get something similar in volvos today, driver alert control(DAC) they call it. It's based on how well you follow the road. If you start to drive wobbly

You can get something similar in volvos today, driver alert control(DAC) they call it. It's based on how well you follow the road. If you start to drive wobbly compared to your "normal" driving pattern you get a warning. "Time for a break?" ...and an icon of a coffee cup :P I remember a few years ago when the technology was ready but it was held back because they thought people would feel insulted by the car but apparently it got through to market now.