Each loading space shall be at least 12 feet wide, 56 feet long and 14 feet high and shall as nearly as may be practicable, be located in such a position as to cause the least hindrance to internal circulation of traffic and the least noise and aesthetic disturbance to the public and neighboring property owners. No loading space shall be located in a position in which any vehicle using the space will block the free passage of pedestrians or vehicles. Where practicable, no loading space shall be located in any front yard.