I looked up the definition in the dictionary. Fences are excluded in the definition of a structure. Referencing Article 8, the fences should be meant as a barrier, not a structure. Mr. Schmidt read page 162, Fences. Mr. Buononato read page 131, Fences.
All references seem to mean to contain animals.
The law does not appear to set any limit on fences accept for the confinement of animals. Mr. Cleary referred to Section 7.10, Special Permits, page 134, General Standards, and said it might be interpreted as being applicable if you consider a fence as a structure other than a building and realize there could be times when the location of the fence might not be appropriate when considering its location versus special permit and it shouldn't adversely affect the general inhabitants of the Town and blocking vision on the highway. I didn't find any more than you did. Mr. Lee referred to page 169 and said they are saying structures are not fences. Mr. Schmidt said the term structures is used incorrectly.