It is unlawful for any pedestrians, equestrian, driver or operator of a vehicle to pass through, or drive between the vehicles comprising, or to interrupt, any regularly organized funeral procession, any procession authorized by the chief of police as herein provided, and the passage of military or naval forces of the United States or of the National Guard of the state when any one of the above-mentioned processions is accompanied by a military, naval or civil police escort which directs traffic at all intersections as used; provided, however, that there is no duty imposed upon the police department or other law enforcement agency of the city to provide such escort services. This provision shall not apply to operation of emergency vehicles. (1961 code § 11.24.010.)