Desirable from a control perspective. Those systems are installed on public toll roads, and demonstrate how easily such things could be integrated without notice or inconvenience to people driving or walking through them every day.
Installed at points most citizens pass through in vehicles and on foot they would inexpensively provide a method to track things entering and leaving states, cities, and various other jurisdictions in a passive 'non-intrusive' manner.
Being even less noticed by your average citizen than more expensive technology such as video cameras already installed throughout society.
However they would require legislation mandating RFID in some sort of item desired to be tracked, along with standards or an agency given the task of standards for such RFID signatures.
Reporting to a computerized database and the resulting data, you could plot and track the flow of the majority of such items as they moved around the nation, state, or local jurisdiction.
The existing EZ pass system already demonstrates everything that is necessary. It monitors and tracks what and when specific RFID goes by. Logging that data in an automated system, and knowing what RFID has passed on what day and when.
