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Validation checking in traffic monitoring equipment

  • US 5,396,234 A
  • Filed: 12/16/1993
  • Issued: 03/07/1995
  • Est. Priority Date: 03/10/1989
  • Status: Expired due to Term
First Claim
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1. In traffic monitoring equipment, apparatus for validation checks in the equipment for checking correctness of a sequence of impulses derived from the passage of vehicles over sensors where the sensors are selected from the group consisting of cables, sensor pads magnetic loop detectors, optical sensors, and pneumatic tube sensors, which apparatus comprises means for comparing a sequence of impulses with a predetermined sequence for the impulses, means coupled to said means for comparing for rejecting the sequence of impulses if it does not agree with the predetermined sequence for the impulses and means coupled to said means for rejecting for generating an error signal if impulses generated by said sensors due to passage of vehicles over said sensors are rejected on one of a regular and repeated basis.

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