Sight triangles shall be required at each quadrant of an intersection of streets and the intersection of streets and driveways. The area within sight triangles shall be either dedicated as part of the street right-of-way or maintained as part of a lot adjoining the street and set aside on any subdivision or site plan as a sight triangle easement. Within a sight triangle, no grading, planting or structure shall be erected or maintained more than 36 inches above the center line grade of either intersecting street or driveway or lower than eight feet above their center lines, excluding street name signs and official traffic regulation signs. Where any street or driveway intersection involves earth banks or vegetation, including trees, the developer shall trim and grade to provide the sight triangle. The sight triangle is that area outside the right-of-way bounded by the intersecting street lines and a straight line which connects sight points located on each of the two intersecting street center lines: arterial streets at 300 feet, collector streets at 200 feet and local streets at 90 feet. Where the intersecting streets are both arterial and collector, two overlapping sight triangles shall be required, formed by connecting the sight points noted above with a sight point 90 feet on the intersecting street. Any development requiring site plan approval shall provide sight triangles at each driveway, with the driveway classified as a local street for purposes of establishing distances. The classifications of existing and proposed streets shall be those shown on the adopted Master Plan or as designated by the approving authority where a new street is not included on the Master Plan. A sight triangle easement shall be expressed on the plat as follows: "Sight triangle easement subject to grading, planting and construction restrictions as provided for in the Edgewater Land Use and Development Regulations Ordinance." Portions of a lot set aside for the sight triangle may be calculated in determining the lot area and minimum setbacks required by the zoning provisions.