I cannot figure out the nature of that TG either....heard some fireground chit-chat on it a week ago.....Tue night of this week, there was a City road crew talking in some detail about lane closures & road repairs. Maybe it is a common TG for all agencies.
Any luck better discerning the use of the many, vaguely-described "Narcotics" & "Organized Crime" TGs of the PD?