[mikeash]

I've been using radar cruise control for a few weeks now (waiting for lane keeping to come this summer as promised!) and I feel much more alert than without it. Obviously it could be an illusion, since the brain is really bad at evaluating itself, but it seems like I'm able to devote more attention to my surroundings and develop better situational awareness when I can stop worrying about the second-by-second job of keeping a safe distance from the car in front of me.