Several methods of classifying vehicles employing mechanical-electrical and television-video tape systems were field tested and evaluated to determine their state of development and possible future use in highway data collection activities. Mechanical-electrical systems tested consisted of an inductance loop detector with two pneumatic road tubes (or two road tubes alone) along with a solid state device which automatically classifies traffic into six categories depending upon axle number and axle spacing. Systems are suitable for both permanent installation and portable use. A permanent system was installed on I-75 south of Atlanta and provides car and truck average speeds in addition to vehicle classification data via telemetry through a dedicated WATS line to a central office computer. The television-video tape system involves the use of a closed circuit television camera and time-lapse video tape recorder to provide a continuous visual record of the traffic stream from which vehicle classification data can be extracted manually from playback on a television monitor. The results of field testing over a 3 1/2 year period indicated that further improvements are necessary and appear attainable before the mechanical-electrical systems can be used with confidence in practical applications.

  • Corporate Authors:

    Georgia Department of Transportation

    One Georgia Center
    600 West Peachtree Street, NW
    Atlanta, GA  United States  30308

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Authors:
    • Alexander, MMJ
    • Threlkeld, R
    • Williams, J
  • Publication Date: 1975-6

Media Info

  • Pagination: 60 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00093949
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: Final Rpt.
  • Created Date: Mar 10 1976 12:00AM