I have plain DD (nor premium or pro) and while I can get adaptive cruise control working, when it's enabled, and I'm on the freeway, no matter how long I hold down the DD button, HA never comes on. At least I don't think it does. Is the Adaptive Cruise Control message supposed to change when HA is active? (I am totally underwhelmed at the manual for this car, I've learned more from reading the forum than from the manual). Is there any message if it's just that the road doesn't support it? This is the loop freeway around Phoenix, so I don't know why it wouldn't be, but ...