FAILSAFE REQUIREMENTS OF ROAD TRAFFIC SIGNAL EQUIPMENT - 2

This paper was presented at Session 27-Traffic systems and analysis. Following the results reported at the Eighth ARRB Conference (1976), it has now been possible to quantify the acceptable fraction of traffic signals failed in 12 defined hazardous display modes, the total fraction being 0.86 percent. These figures are based on the audience studies reported previously, and on rates of occurrence of accidents at blacked-out traffic signals (obtained from police reports), together with figures for the average number of blacked-out signals (obtained from departmental fault report records). There has been further extension of the analytical method previously reported for determining the fraction of unreported defective signals from fault report records. Interpretation of the observations is complicated by observations of differential failure rates at weekends, and during the working week. An acceptable failsafe display (for use in N.S.W.) has been identified by public opinion survey. The paper concludes with a discussion of options available to achieve the required level of service. (TRRL)

• Record URL:
  http://arrbknowledge.com
• Supplemental Notes:
  • Proceedings from the Ninth Australian Road Research Board Conference, Brisbane, August 21-25, 1978.
• Corporate Authors:

  ARRB

  Melbourne, Victoria  Australia 
• Authors:
  • Davies, L W
  • HULSCHER, F R
  • Syme, J W
• Conference:
  • Australian Road Research Board Conference Proc
• Publication Date: 1979

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 69-78
• Serial:
  • Volume: 9
  • Issue Number: 5

Subject/Index Terms

• TRT Terms: Conferences; Crash rates; Crashes; Equipment; Fail safe systems; Failure; Hazards; Information display systems; Public participation; Significance (Statistics); Traffic control; Traffic signals; Weekdays; Weekends
• Old TRIS Terms: Displays; Fail safe
• ITRD Terms: 1643: Accident; 1612: Accident rate; 8525: Conference; 3674: Equipment; 5520: Failure; 142: Public participation; 6532: Significance (stat); 654: Traffic control; 565: Traffic signal
• Subject Areas: Geotechnology; Highways; Materials; Operations and Traffic Management; Safety and Human Factors; Society; I73: Traffic Control;

Filing Info

• Accession Number: 00309141
• Record Type: Publication
• Source Agency: ARRB
• Files: ITRD, TRIS, ATRI
• Created Date: Jun 26 1980 12:00AM