Kanc +:
People drive the Kanc all the time and are completely oblivious to this 13 mile stretch of forest:
from: Linsey Rd @43.937560, -71.881160 to: 44.021953,-71.732483 - Google Maps
Less traffic than the Kanc, too. It's getting a little bumpy (so is Bear Notch road.) but they repaved some of it from what I heard.