19.00.030 HI-LOW ABANDONMENT SIREN
Use of the “Hi-low” Abandonment siren mode is meant to be used as a signal of serious emergency circumstances affecting the public. The Department authorizes use of the "Hi-Low" Abandonment siren mode on siren-equipped police vehicles only under the following circumstances:
It will be used only as an evacuation or recall signal when absolutely necessary and only when authorized by a police commander/supervisor, or a Fire Department command officer.
At fire scenes, officers will use the "Hi-Low" siren only at the direction of the Fire Department Incident Commander.
The "Hi-Low" siren will not be used by officers during any emergency or pursuit driving situation.