Note that Route 20 is a smooth, wide two-lane road with many sections having a third lane on the uphill climbs. If you are hauling a trailer, be aware that Route 20 cuts across a quite hilly part of New York, and it goes up and down steeply. It is rarely flat. This is what the guide books call "scenic", and in this case, believe it.
Cellular phone service is spotty, especially in the valleys.