We had a survey done for our camp this summer. The survey wasn't related to any disputes or title insurance things. We needed an electrical permit to up grade the service and a health permit to put in a trailer. We couldn't either permit without having fairly definite property lines.
It seems that 'fairly definite' is about as good as you can get many places. The surveyor was having trouble placing one rear corner, and said some things I found interesting. Quite a bit of survey work in the country can't be reconciled. In our case, the original drawing indicates a surveyor's bar at the rear corner. A later drawing by same surveyor indicates the same corner as having a bore hole. However, nowhere in the field notes does the surveyor say he replaced a stake with a bore hole. We did find something of a bore hole, but not the type a surveyor would ordinarily use.
So, the surveyor asks us: 'Did anybody ever tell you that hole was the property corner?' 'No,' we said. He said that he couldn't resolve the corner using known points and angles on near-by properties. He said he would be prepared to defend the bore hole because the original surveyor wasn't always orthodox, because his survey information suggested the corner might be further, and because nobody says the bore hole isn't the corner.
So, I hope you get the idea that a survey is a guarantee of property lines only as long as there is no dispute. In a legal dispute, survey information is only one type of supporting information. The surveyor also said that, here in Ontario, judges usually support community usage over survey information if the two conflict. He said that several neighbours who say that the bore hole was used as the property line would be stronger in court than anything he could do.
Our camp also contains a piece of an old highway and right of way. Locals use the old highway across our place to get onto the new highway. The only other entrance is under a low railroad bridge at a sharp bend and is very dangerous.
A new highway access is planned, and we may want to close the old highway since we may have some liability. However, I believe we need to go to court and petition a judge to issue a road closure order. In Ontario, roads that are used to access property can only be closed by judicial order--even if they cross private property. The road to my brother-in-lay's camp goes between somebody's house and barn.
So, I don't know if the law in your area is similar. Best advice I can think of is avoid legal procedures if possible. If you get into one, they can become very complex and very costly, and in the end, the legal resolution may end up fluke' or whimsical. Getting a local authority (social services or police) to bring in a conflict resolution mediator may be much better than court. On the other hand, if the other parties end up going to court, then probably need your own lawyer to look out for your particular interests.
