AUTOMATIC DETECTION OF URBAN FREEWAY INCIDENTS
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.
- Report on Traffic Management and Control Systems. Sponsored by the Texas Highway Dept., Austin. In cooperation with the Federal Highway Administration, Washington, D.C.
Arlington, TX United States 76011
Washington, DC United States 20590
- Nuckles, N B
- Dudek, C L
- Messer, C J
- Publication Date: 1973-5
- Pagination: 90 p.
- 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