On a corner lot in any O-LR Office Low-Rise Zone District, nothing shall be erected, placed, planted or allowed to grow in such a manner as to materially impede vision between a height of two and one-half (2 1/2) feet and 10 feet above the center-line grades of the intersecting streets in the area bounded by the street lines of such corner lots and a line joining points along said line 30 feet from the point of intersection, nor shall a principal structure be located less than 20 feet from the side street line. All sight rights, where applicable, shall be subject to County of Bergen and New Jersey Department of Transportation approvals.