External indicator for electronic toll communications

  • US 20060082470A1
  • Filed: 10/20/2004
  • Published: 04/20/2006
  • Est. Priority Date: 10/20/2004
  • Status: Active Grant
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First Claim
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1. An external indicator for use in proximity to an on-board unit of an electronic toll collection system, the electronic toll collection system including a roadside unit for communicating with the on-board unit and conducting an electronic toll collection (ETC) transaction, the external indicator comprising:

  • an RF antenna;

    an RF detector coupled to said RF antenna for demodulating an RF signal induced in said RF antenna by an RF transmission and for outputting a demodulated signal;

    a processor having an input for receiving said demodulated signal and an output for providing an indicator signal, the processor having a component for determining if said demodulated signal is indicative of an ETC transmission between said on-board unit and said roadside unit and, if so, generating said indicator signal; and

    an indicator device coupled to the output of said processor, said indicator device producing a sensory event in response to said indicator signal.

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