Picket lines and picketing shall be subject to the following additional regulations:
(A) Picketing may be conducted only on the sidewalks reserved for pedestrian movement and may not be conducted on the portion of a street used primarily for vehicular traffic;
(B) Not more than ten pickets promoting the same objective shall be permitted to use either of the two sidewalks within a single block at any one time;
(C) Pickets must march in single file and not abreast and must not march closer together than 15 feet, except in passing one another.
('84 Code, § 19-8)