The development and testing of incident detection algorithms was based on freeway surveillance data obtaned in Los Angeles and Minneapolis. The Los Angeles data were in the form of samples of the sensor presence pulses fifteen times per second. These data were aggregated in the form of twenty-second averages, by lane, of occupancy and volume. The Minneapolis data were already aggregated in the form of thirty-second averages of occupancy and volume, usually averaged over all lanes at a sensor station. The organization and contents of these tapes are described in the Report FHWA-RD-76-74. These data tapes were used in the development of incident detection algorithms described in FHWA Reports FHWA-RD-76-19, FHWA-RD-76-20, FHWA-RD-76-21 and FHWA-RD-76-22 titled 'Development and Testing of Incident Detection Algorithms' Volumes 1 - 4. The three reels contain condensed data sets, each set consisting of three files. Reel 1, the Los Angeles data tape, contains three data sets with Incident Data. Reel 2 is a continuation of the Los Angeles data tape with one data set of Incident Data, one with Incident-Free Data and one set with Mulfunction Data. Reel 3, the Minneapolis data tape, contains one data set of Incident Data and one set of Non-Incident Data.

  • Supplemental Notes:
    • Price includes documentation, PB-263 644, PB-263 645, and PB-263 646. Source tape is in BINARY character set. Character set restricts preparation to 9 track one-half inch tape only. Identify recording mode by specifying density only. Call NTIS Computer Products, if you have questions.
  • Corporate Authors:

    Federal Highway Administration

    Traffic Systems Division, 1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Authors:
    • Tignor, S
    • Wilbur, A D
  • Publication Date: 1976-2

Subject/Index Terms

Filing Info

  • Accession Number: 00151803
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: FHWA/RD-76-74A, FHWA/DF-77/001
  • Files: NTIS, USDOT
  • Created Date: May 11 2002 12:00AM