A FLEXIBLE SYSTEM FOR THE AUTOMATIC ANALYSIS OF VEHICLE MOVEMENTS AT INTERSECTIONS

This paper was presented at Session 16-Instrumentation for detection and data acquisition. A flexible system is described that collects data such as speeds, headways and gap 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 single pair lead wires to form a 20 ma current loop 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 both the real time computer program for data logging and the program for the automatic reduction of the raw data. (TRRL)

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 12-17
  • Serial:
    • Volume: 9
    • Issue Number: 5

Subject/Index Terms

Filing Info

  • Accession Number: 00309142
  • Record Type: Publication
  • Source Agency: ARRB Group Ltd.
  • Files: ITRD, TRIS, ATRI
  • Created Date: Jun 26 1980 12:00AM