I think the fear and the expectation (based on extensive previous experience) is that this technology, regardless of it's stated purpose, will be used to eke out a few extra seconds of efficiency from human drivers. Which will likely lead to stress and extra fatigue.

In my book, automating boring and repetitive tasks is good even if it leads to some job losses. Turning humans into robots by optimizing for every bit of near-term efficiency is not. My 2c.