I think the lane assist feature kicks in and out at 37 mph. I have not tested that out. When traffic slowed down, I always had my hands on the wheel and didn't pay attention. The few times traffic came to a dead stop with ACC, the adaptive cruise control picked right back up. It never shut off. However, if your eyes are not forward, it will shut off.
A couple of things to note. For lane assist to work, it needs to be able to read the lines, blind spot functional, AND it needs a GPS signal. So I'm assuming you go into a tunnel it's going to nag you about taking over. When active, there are three levels Green, Yellow, Red. Green is obvious. All conditions are met for it to work. Yellow is a warning because you took your eyes off the road. Without turning my head and just shifting my eyes over to see the nav screen, it only took 2-3 seconds for this to kick in. The last is red because it's pissed you aren't watching the road. If you continue to ignore it while it is red, it will automatically come to a complete stop in the middle of the road. I guess this is good if you just experienced a medical emergency but if you're just turned around to smack the unruly kids around in the back seat, prepare for it to brake. Oh, and if you really like these features, you have to pay for them after 3 years.
The last interesting thing is.....It's spying on you.
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