Eric
Mama's lil stinker
It sounds like this is pretty different depending on car manufacturer, I know in my BMW it's like bumper bowling and you can't take your hands off the wheel for more than 10 seconds or so but in slower traffic it keys in on the car in front of you and works flawlessly. Still, at freeway speeds I never take my hands off the wheel, it often struggles to read the lines, even when they seem visually obvious.