The system 2, wherein the monitoring system is further configured to transmit, to {HEAD ~ the wheel unit} of {TAIL ~ the shopping cart} that is approaching the exit, information that controls whether the wheel unit performs an action that inhibits shopping cart motion 
of
The system 2 , wherein the monitoring system is further configured to transmit , to { HEAD ~ the wheel unit } of { TAIL ~ the shopping cart } that is approaching the exit , information that controls whether the wheel unit performs an action that inhibits shopping cart motion
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH