Could be the dirt road underneath, but yeah, probably sand...and we have a 4WD pickup truck so I drive pretty much where I want, within reason mostly.Ah Vermont. Hope to be up soon to ski!
I remember having some ri friends up and driving to okemo from my house in quechee and one of them asking if everyone in Vermont drove on the wrong side of the road and i said no we just drive where the road is cleared (or at least sanded in your case brother nemo).