Section 730(d) in Police Regulations, Bengal , 1943
(d)When streets are lined by the police for public functions or State occasions, all officers should be warned that their duty is to watch the crowd, traffic and houses and not the procession. When the procession of carriges, etc., is a very long one, the Superintendent should consider the advisability of posting every second constable on either side of the road, with his face towards the spectators on the footpaths.
