I do a lot of motorcycling on back roads all over the place. I figure a good motorcycle road is a good top down road.
Route 118 from Warren to Woodstock can be fun, there's almost no houses or side roads and little speed enforcement.
116 from 112 to Franconia is good.
Winona Road from Meredith to Ashland has some great curves.
175 from Holderness to Woodstock is good.
113 from Fryeburg, ME to route 2 is good.
Hurricane Mountain Road from Intervale to wherever it is that it comes out is awesome.
153 from Wakefield to Conway is great.
VT 232 from Groton to Marshfield is excellent
And now my favorite...
EVERY back road between 93/Everett tpk, 89, VT91, and MA2 is good to awesome. That whole south west area of NH has amazingly fun roads and no crowds. Pretty much every village you pass through is lovely too.
If you want a longer trip, upstate NY has wonderful top down roads. As does Dutchess County NY. The farm land in Dutchess County between The Hudson River and route 22 is staggeringly pretty.
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