For the purposes of this article, the following terms and phrases shall have the meanings set forth in this section, unless a different meaning is clearly indicated by the context:
Any fixture such as a wall or fence, boulder, shrubbery, planting, bushes or trees (except only grass) which intrudes into or invades any portion of the public right-of-way; provided that trees planted parallel to the public right-of-way, which do not obstruct passage, are permitted.
Any permanent hindrance, obstacle or barrier which in any manner impedes the flow of traffic on the highway and closes it to public travel.
The holder of the title in fee simple of the real property on which said encroachment or obstruction is situated.
Any permanent underground device installed for private use, such as but not limited to underground irrigation systems or in-ground electric pet fencing systems.
The officer or officers who are authorized by this article to exercise the powers prescribed herein.
Any street, road, avenue or highway, including the sidewalk areas, for the full width of the dedication to the public.