When it comes to Automated Vehicle Identification (AVI), which is used to identify vehicles by tagging with a radio frequency (RF), one is faced with the decision between a passive tag and an active tag. An active tag has a battery and transmits its ID to the reader either continually or when a reading is sensed but the passive tag does not have a battery, it absorbs RF from the reader and responds to the reader with its ID numbers, thus drawing its power from the reader. Both the active and passive tags have positive and negative aspects. The active tag is able to read from a long distance and fast speeds but one needs to worry about replacing dying batteries. The benefit of long distance reading capabilities can backfire if a car is in line and it's ID is read and granted to the car before, thus ultimately denying access to the correct car. Passive tags can only be read within 15 feet, at a very slow rate, if not completely stopped, but there are no drawbacks of replacing batteries or mix-ups in lines. Although passive tags are less expensive, it is important to make an educated decision as to which method is better for the particular application by taking into consideration speed, reading range, and budget.

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  • Corporate Authors:

    Bricepac, Incorporated

    12228 Venice Boulevard, Suite 541
    Los Angeles, CA  United States  90066
  • Authors:
    • Cram, D
    • Bigbee, M
  • Publication Date: 2003-8


  • English

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Subject/Index Terms

Filing Info

  • Accession Number: 00963442
  • Record Type: Publication
  • Source Agency: UC Berkeley Transportation Library
  • Files: BTRIS, TRIS
  • Created Date: Oct 2 2003 12:00AM