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