An automatic incident detection model using the standard normal deviate (SND) of the control variable (energy or lane occupancy) was proposed, developed, and evaluated. Two strategies were tested using a 3- and 5-minute data base for each control variable. The first strategy (A) required one SND value to be critical; whereas the second strategy (B) required two successive SND values to be critical. Strategy B using lane occupancy with a 5-minute time base was found to produce the best results. It detected 92 percent of the 35 incidents studied during moderate and heavy flow (750-1800 vph per lane) with a computer response time of 1.1 minutes, and operated at a 1.3 percent false alarm rate during the peak period, which can be reduced to 0.2 percent by using a two-station control criterion in which an incident would not be flagged until two successive upstream stations register critical SND values.

  • Supplemental Notes:
    • Report on Traffic Management and Control Systems. Sponsored by the Texas Highway Dept., Austin. In cooperation with the Federal Highway Administration, Washington, D.C.
  • Corporate Authors:

    Texas Transportation Institute

    Texas A&M University System, 1600 E Lamar Boulevard
    Arlington, TX  United States  76011

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Authors:
    • Nuckles, N B
    • Dudek, C L
    • Messer, C J
  • Publication Date: 1973-5

Media Info

  • Pagination: 90 p.

Filing Info

  • Accession Number: 00080234
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: TTI-2-18-72-165-12 Res. Rpt.
  • Files: NTIS, USDOT
  • Created Date: Jan 29 1975 12:00AM