I had to turn this feature off so when I walked past it in the garage, it wouldn't open up and hit my garage door.
That's the one feature I wish I have in the GT2 that I don't have in the GT1. On the other hand, I would hate to have to turn it off while in the garage, so maybe for me that's a blessing in disguise I suppose.
I believe there is a way to calibrate it to only open up to a certain height and it will stop so it won't hit the roof. I think it might be in the owner's manual.