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I've found traffic aware cruise control greatly reduces driver fatigue as you don't have to constantly manage your speed. This improves both safety (you stay more alert and can spend more of your effort scanning and maintaining situational awareness) and means you're less tired to engage in other activities when not driving.

Driving assistance is about safety, not about convenience.

> I don't care about driving. It still takes the same amount of time.

If it would be automated, the you would be able to use this time for something else rather than driving.

In theory yes, in practice mostly no.

Can you elaborate why mostly no in practice?

You're sitting in a confined space with semi-random forces acting on you.

I am succesfull with productive and semi-productive activities in a buses (at least when travel time is below 8 hours).