Surely "when I'm tired" is one of the situations in which this tech should not be used. In Australia, for example, where long-distance driving is common, fatigue is one of the biggest contributors to road accident statistics.
Apart from the risk of someone actually falling asleep while the car is on auto-pilot, anything that reduces one's alertness over the duration of a drive makes this technology more dangerous (which is not to categorise it as dangerous).
The road recognition features would deal with simple cases like drifting out of lane but not so much in built-up areas or around unpredictable drivers. I think a big part of safe driving is adapting to accommodate the behaviour of other road users. Hopefully some tech will be developed in this area such as recognising inappropriate signalling, drifting out of lane, tailgating (ahead) etc.
Apart from the risk of someone actually falling asleep while the car is on auto-pilot, anything that reduces one's alertness over the duration of a drive makes this technology more dangerous (which is not to categorise it as dangerous).
The road recognition features would deal with simple cases like drifting out of lane but not so much in built-up areas or around unpredictable drivers. I think a big part of safe driving is adapting to accommodate the behaviour of other road users. Hopefully some tech will be developed in this area such as recognising inappropriate signalling, drifting out of lane, tailgating (ahead) etc.