I just did a 2800 km road trip in my new Mazda which has a lot of these systems. This is all new to me, the car it replaced was 10 years old. Loved the adaptive cruise, especially in the stop and go of lower mainland near Vancouver. Did have one odd thing happen, was in cruise control with no one directly in front of me on some two lane highway through the mountains east of Sicamous. A car outside the range of my adaptive cruise moved into a left turn lane and slowed to a stop to wait for a gap. My car picked it up as stopped in my lane and started with "brake now" warnings and it began to slow me down. I hit the gas and the warning went away and I kept going fine. All I can think of is the road was slightly curved to the left and my lane keep system seems to lose its alignment on curves.
I still think the safety features are useful and important, it was one of the biggest reasons we pulled the trigger on a new car. But I also think there is still a ways to go on some of them. I think it is pretty fantastic that these systems are available in the lower end of the market (we test drove a Kia Seltos with them for example). If I could afford to put my upcoming new driver kid in one, I wouldn't hesitate.
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