Analysis of vehicle movements at intersections continues to be of significant interest in the study of road user behaviour. A flexible system is described that collects data such as speeds, headways, and gaps acceptance for vehicles on each arm of an intersection. An array of inconspicuous vehicle detecting switches is employed through a direct interface to a mini-computer. A real time data logging program stores the incoming data on a digital cassette unit. The hardware design of the detector system is very adaptable and can be used in conjunction with any mini-computer or micro-processor through a standard serial interface. Each detector in the array is connected to an encoder unit. These encoders in turn are interconnected in series by a single pair lead wires to form a 20 ma current data path. A unique code is transmitted for each detector every time it is struck by a vehicle wheel. The advantages of this system are described. An outline is given of the design of the real time computer program for data logging and a step-by-step description of the algorithm employed in the program for the automatic reduction of the raw data. The system has been fully field tested by simultaneous application to the arms of a "tee" intersection and its viability demonstrated. (Author/TRRL)

  • Availability:
  • Corporate Authors:

    Monash University

    Human Factor Groups, Wellington Road
    Clayton, Victoria 3168,   Australia 
  • Authors:
    • Mare, W K
  • Publication Date: 1978-7


  • English

Media Info

  • Features: Figures; References; Tables;
  • Pagination: 43 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00341662
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • ISBN: 0 909835 82 9
  • Report/Paper Numbers: HFR-7 Monograph, HS-024 422
  • Files: HSL, ITRD, TRIS, ATRI
  • Created Date: Dec 22 1981 12:00AM