Sight triangles. Sight triangle easements shall be required and shall include the area on each street corner that is bounded by the line which connects the sight or "connecting" points located on each of the right-of-way lines of the intersecting street. The planting of trees or other plantings or the location of structures exceeding 30 inches in height that would obstruct the clear sight across the area of the easements shall be prohibited, except for street signs, fire hydrants, light standards, or trees with a high branching pattern that leave a minimum clearance of 10 feet between the lowest branches and the ground. A public right-of-entry shall be reserved for the purpose of removing any object, material or otherwise, that obstructs the clear sight. The distances shown in Exhibit 9-8[1] between the connecting points and the intersection of the right-of-way lines shall be required.