I really enjoy the ACC on my Volt, but there is one thing about it that you need to be aware of. When a vehicle in front of you slows down as in about to make either a left or right turn, the Volt slows down and may continue to slow down even more than you are anticipating even though the car is clearly "out of your way". The ACC radar still "sees" that car as being in front of you. Anyone following behind you may end up getting way too close to you because they haven't expected you to continue to slow down. I guess what I am trying to say is, be prepared to "take over" and accelerate away from the turning car in front as soon as you have safe clearance. This may avoid a rear ender that would not be good.