This paper describes recent developments which have led to the improvement of conventional vehicle detectors and which make possible new types of vehicle detector. The various physical phenomena which have been employed to produce vehicle detectors are reviewed. The improvement that can be made to conventional vehicle detectors through the use of modern electronic techniques is illustrated with the design of an inductive loop vehicle detector. This detector is based on a digital circuit which measures the loop inductance. Subsequent processing is performed by a microprocessor and the detector operation is defined by software. Considerable flexibility is afforded by this approach and a significant improvement in the noise performance of the detector is achieved. As an example of an area of current research interest, the results of an investigation into the feasibility of producing a low cost dynamic load sensor are given. These indicate that new sensors based on triboelectric and piezoelectric materials can be used as load sensors provided that the mechanical coupling between the load and the sensor can be properly controlled. Finally, the possibility of using pattern recognition techniques to process an image of a road or intersection to yield an accurate description of all vehicles in the area is discussed. In the long term this approach is believed to be well suited to the task of monitoring urban traffic. The number of the covering abstract for the conference is IRRD no. 277326. (Author/TRRL)

Media Info

  • Features: Figures; References;
  • Pagination: p. 195-207
  • Serial:
    • Volume: 12
    • Issue Number: 4

Subject/Index Terms

Filing Info

  • Accession Number: 00393591
  • Record Type: Publication
  • Source Agency: ARRB
  • Files: ITRD, TRIS, ATRI
  • Created Date: Apr 29 1985 12:00AM