Any person, whether the property owner, the owner's agent, or
the owner's employer, obstructing the sidewalk area while constructing,
reconstructing, maintaining or repairing of a building or other structure
on the property, or grading any sidewalk areas, or constructing, reconstructing,
maintaining, or repairing any curbs, gutters, sidewalks, driveway
entrances, retaining walls, or trimming, removing, or planting any
trees, evergreens, hedges, plants, or shrubbery in or near the sidewalk
areas, or opening or excavating in or under any street, alley, highway,
or sidewalk area, or temporarily obstructing any street, alley or
sidewalk or by temporarily storing or depositing of materials, for
delivery of materials, or for any other legitimate purpose, shall
place suitable signs, barriers, and/or lights so as to protect the
users of streets, highways, alleys, or sidewalk areas in the vicinity
thereof from injury to person or property.