I just got back from running a couple of errands. The ice on the hood and the lid of the truck was about 2" thick, thank goodness, I was able to get it off in parking lots, rather than have it fly off and hit the car behind me! It could have done some serious damage.
Our driveway faces north and I've been chipping on it, but it really, really doesn't want to come off.
The other day at Walmart, I saw a hugh sheet of ice from the top of the light post...one of those massive lights in the parking lot, you know...fall off and hit the hood of a car underneath.
It didn't seem to do much damage to the car, but had it hit a person, it would've smarted, I'm sure.
Yesterday we watched a couple episodes of This Old House, and they were putting radiant heating under the driveway and the walk up to the house... how posh is that? ;~)