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In all districts, as indicated, all permitted or required open off-street loading berths shall be screened from all adjoining zoning lots, including such zoning lots situated across a street by either:
(a) a strip at least four feet wide, densely planted with shrubs or trees that are at least four feet high at the time of planting and that are of a type which may be expected to form a year-round dense screen at least six feet high within three years; or
(b) a wall or barrier or uniformly painted fence or fire-resistant material, at least six feet but not more than eight feet above finished grade. Such wall, barrier or fence may be opaque or perforated, provided that not more than 50 percent of the face is open.
In addition, such screening:
(1) shall be maintained in good condition at all times;
(2) may be interrupted by normal entrances and exits; and
(3) shall have no signs hung or attached thereto other than those permitted in Section 22-32 (Permitted Non-illuminated Accessory Signs).