Posting of Private Roads in Moultonborough?

[newbie]

Can someone help explain the process of road postings in the Town of Moultonborough for private roads. I have heard differing points of view.

Therefore.....

When Moultonborough posts their roads does it affect even private roads?

When do they typically do it?

I have heard that it is for all vehicles over 10,000 lbs, true?

Any help demystifying this subject would be greatly appreciated

Thanks

Newbie