A.
No obstructions such as signs, structures, parked vehicles, fences or vegetation shall be permitted in any district between the heights of 2 1/2 feet and 10 feet above the plane through the mean curb grades within the triangular space formed by a fifteen-foot setback from the intersection of the two street right-of-way lines, except for the B1 Central Business District.
B.
For collector and arterial streets intersecting with other collector or arterial streets or railways, the corner cutoff distances establishing the triangular vision clearance space shall be increased to 50 feet.