At the intersection of two (2) or more streets (except in the C-1 District) no hedge, solid fence or wall shall be permitted to be higher than three (3) feet above the curb level in the triangular area formed by the intersecting street lines and a line drawn joining points on the street, each twenty-five (25) feet distance from the point of intersection of the street lines. In the C-1 District, the same above mentioned three (3) feet height shall apply except that measurement of the sight triangle shall be at the distance of seven (7) feet from the point of street line intersection.