The talkgroups in question are mostly car to car related. Unless someone on the North (46112) talkgroup says "switch to city/car to car/etc" these TGs are silent. They are used but not frequently. Most chit-chat is done on Messenger on their laptops or on a cell but occasionly you will hear some traffic.
American Fork should be full of activity as Steel Days is later this week.
As stated North is the Dispatch channel for the following:
Am Fork (5J)
Lone Peak (Alpine/Highland) (18J)
Saratoga Springs (26J)
Am Fork also provides PD for Cedar Hills (24J). Saratoga Springs provides PD for Bluffdale in Salt Lake County. Officers are identified as "India" units unless a multiple agency incident (landing a bird, on a UPD channel, etc.) In this case they use the state identifier 18I or 18 India.
RS PRO-96, RS PRO-95 (2), RS PRO-94, RS PRO-93, RS PRO-2096, RS PRO-2067 (3), Uniden BC 60-XLT (3), Uniden BCT 7.