"Geofencing is a virtual fence that controls vehicles’ movements within a geographical area. By restricting vehicles from moving outside specific areas and control the speed limit."
To read about more sinister ways geofencing tracks and monitors your every movement eg "Geofencing system can easily track elderly people and kids that might be wearing GPS bracelets. Parents, guardians or family members can create a geofence around a child, elderly person or a pet so whenever they move out of the designated area the system generates an alert."
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