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Inductive loop sensor for traffic detection, and traffic monitoring apparatus and method using such a loop sensor

  • US 6,337,640 B2
  • Filed: 03/31/1999
  • Issued: 01/08/2002
  • Est. Priority Date: 03/31/1999
  • Status: Expired due to Term
First Claim
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1. An inductive loop sensor for detecting vehicles travelling along a lane of a roadway, the sensor comprising a continuous conductive loop, the loop being configured to provide a central conducting segment and outer conducting segments spaced on opposite sides of said central segment, whereby an electric current in the loop flows in a first transverse direction along said central segment and in a second transverse direction opposite to said first transverse direction along each of said outer segments,wherein said loop is aligned on said roadway lane so that said central and outer segments extend transverse to the traffic flow direction in said lane, the distance between the outer segments of the loop being not greater than 60 cms.

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