You might find some information on the ancient roads email list (listserve)
I think this link (the listserve pages) will answer most of your questions.
It is Act 178 that towns are complying with, or attempting to comply with.
From: Town of Fairfield <[log in to unmask]>
Sent: Oct 15, 2008 4:14 PM
To: [log in to unmask]
Subject: Ancient Roads
Can someone give me some background on the ancient roads project and why the towns are doing this. What is the deadline? Also, has anyone outsourced the work in locating and declaring these roads and who is it you have used?Amanda L. Forbes
Fairfield Town Clerk/Treasurer
P.O. Box 5
Fairfield, VT 05455
Ph: (802) 827-3261
F: (802) 827-3653