When authorized signs are in place, commercial vehicles are prohibited from stopping, parking, or standing with the wheels of such vehicle more than 18 inches from the curb on the south side of Center Street adjacent to the established taxi stand zone between Shattuck Avenue and Milvia Street, more specifically described as that area beginning at the front of the passenger loading zone and extending 150’ in the westerly direction. (Ord. 6689-NS § 1, 2002)