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To: Dan Cooper

Uh, no. I-PASS electronically collects tolls using a radio frequency system which “activates” your transponder about 3 blocks before the deduction is taken.


16 posted on 04/06/2005 11:14:52 PM PDT by endthematrix (Declare 2005 as the year the battle for freedom from tax slavery!)
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To: endthematrix
Uh, no. I-PASS electronically collects tolls using a radio frequency system which “activates” your transponder about 3 blocks before the deduction is taken.
That's a big, active (meaning battery powered) RFID on your windshield, not on a metal surface. On some vehicles it has to be mounted on the outside of the windshield because of metal oxides in the glass. The passive RFIDs that are small enough to be housed in a sticker have a much shorter range. These passive tags are basically charging up using the radio energy sent by the reader/transciever and transmitting a short burst of information. It is a much weaker transmission than the active RFIDs and can't be read from more than a few meters. Active RFID tags have a limited life because of the battery and are more expensive.

I don't think active RFIDs are what is being suggested here. So unless they are proposing passive windshield tags that can be read at about 10~15 ft, I don't think that they have done their homework.

19 posted on 04/07/2005 12:32:20 AM PDT by Dan Cooper
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