Don't know what they refer to as the Post Rd. Only Post Rd I know is the
Boston Post Rd and that is the same as Rt. 1, Barnum Ave and various other
names, along the Coast.
Only one I see that looks like a possible would be Rt. 67. Someone in that
area might be able to tell you if it have various names other then Rt. 67.
I have a brother in Litchfield - I will check with him.