3. VISION TRIANGLE.
a. General. A vision triangle shall be provided at each intersection of 2 streets, an alley and a street, or an access drive and a street in the zoning districts specified in this subsection.
b. Description. A vision triangle is the triangular area formed by connecting the point of intersection of the curbs at the intersection of 2 streets, or the point of intersection of the alley or driveway line with the side of sidewalk closest to the property line, with 2 other points each located an equal distance away from the point of intersection along the 2 lines that intersect. Where sidewalks are not present, the point of intersection shall be 4 feet streetside of the property line, along the alley or driveway line extended.
c. Required Vision Triangles. The measured distance along the intersecting lines, as specified in par. b, shall be the following:
c-1. In all zoning districts, 10 feet for the intersection of an access drive and a street.
c-2. In the RS6, RT4, RM4 and RO2 zoning districts, 15 feet for the intersection of 2 streets or an alley and a street.
c-3. In the RS5, RT3 and RM3 zoning districts, 20 feet for the intersection of 2 streets or an alley and a street.
c-4. In the RS1 to RS4, RT1 and RT2, RM1 and RM2, RO1, NS1, LB1, RB1, IO1, IL1 and PK zoning districts, 25 feet for the intersection of 2 streets or an alley and a street.
c-5. In all other zoning districts, no vision triangle shall be required at the intersection of 2 streets or an alley and a street.
d. Objects Within Vision Triangle. Opaque fences and other opaque objects, such as but not limited to coniferous trees and shrubs and utility boxes, located in the vision triangle shall not exceed 3 feet in height. Semi-opaque and open fences and other semi-opaque objects, such as but not limited to deciduous trees and shrubs, sign and utility poles, traffic standards, and masonry fence piers not exceeding 16 inches in width, shall be permitted.