For non-dwelling uses, where there is an existing curb and gutter or sidewalk on the street (or private road), a safety island along the entire frontage of the property shall be provided, except for the permitted driveways. On the ends and street (or private road) side of each such island shall be constructed a concrete curb, the height, location, and structural specifications of which shall be approved by the Township Engineer. Maximum and minimum curb return radii permitted and minimum driveway approach angles to the center line of the street (or private road) are required.