Rt 113 (the part they close in winter)

Rt 27 (all of it is great but the northern half from Augusta to Canada is the best)

US 201 (this time from Skowvegas to Canada)

Rt 220 from Waldoboro to Unity

And finally, any road that doesn’t have any lines painted on it, that has no visible power lines, and no houses: e.g. the Mayall RD in Gray. It’s short, but sweet