Sight triangles shall be required at each quadrant of an intersection of streets and 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 the lot adjoining the street and set aside on any subdivision or site plan as a sight triangle easement. Within a sight triangle created by two intersecting streets and its extension into the street right-of-way, no grading, planting or structure shall be erected or maintained more than 3 1/2 feet above the street level measured at the curbline or in the absence of a curb at the edge of the roadway, but excluding utility poles, 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 such vegetation and trees, as well as establish proper excavation and grading to provide the sight triangle. The sight triangle is that area bounded by the intersecting curblines and a straight line which connects sight points located on each of the two intersecting curblines 20 feet away from the intersecting curblines, or, at the option of the property owner, the sight triangle calculated in accordance with the 2018 Edition of AASHTO (American Association of State Highway and Transportation Officials) "A Policy on Geometric Design Highways and Streets" (2018 Green Book). Property owners opting to calculate the sight triangle in accordance with the 2018 Green Book shall provide the Township Engineer and Zoning Officer with a survey showing the graphics of the sight triangle, taking into account the width of the intersecting roadways, the speed limits on such roadways, the grades of the interesting roadways, the location of any stop lines or traffic signage at the intersection and such other information required by said publication in calculating sight triangles. Any proposed development requiring site plan approval shall provide sight triangle easements at each driveway with the exit driveway being one side of the sight triangle. Its measurement shall be from the intersection of the curbline to the driver's position of a vehicle standing on the exit portion of the driveway that is immediately contiguous to the street line. The measurement along the curbline shall be as previously determined. A sight triangle easement dedication shall be expressed on the plat as follows: "Sight triangle easement subject to grading, planting and construction restrictions as provided for in Chapter 33 of the Teaneck Township Code." Portions of a lot set aside for the sight triangle may be calculated in determining the lot area and may be included in establishing the minimum setbacks required by the zoning provisions.