I think there was too much added ethanol in the fuel, the car got dizzy :)
http://www.bywaymap.com/index.html
I found that, guessing the green ones you could drive down although looking at one of the green lines in my area I know it's just a dirt/gravel road so not all the green lines are challenging!
I think for that area people paid to use, or need to become a member or something. I only went to look for a day, maybe they aren't always on their roofs! (That and the UK weather, probably why that car you were looking at doesn't have a glass roof :P)
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