INTERIM REPORT, DEVELOPMENT OF WARRENTS FOR RURAL AT-GRADE INTERSECTION ILLUMINATION

A METHODOLOGY IS FORMULATED THAT MEASURES THE EFFECTS OF ILLUMINATION OF RURAL AT-GRADE INTERSECTIONS IN QUANTIFIABLE TERMS. PREVIOUS RESEARCH INDICATED THAT ACCIDENT REDUCTION IS A VALID CRITERIA FOR EVALUATING LIGHTING EFFECTIVENESS. THE EFFECTIVENESS OF ILLUMINATION IN MODIFYING SEVEN ACCIDENT MEASURES WAS EVALUATED BY AN ANALYSIS OF VARIANCE. NO SIGNIFICANT RELATIONSHIP BETWEEN ACCIDENT SEVERITY AND ILLUMINATION COULD BE INFERRED FROM THE DATA. A PREDICTOR OF ACCIDENT REDUCTION WAS DEVELOPED BASED ON THE RATIO OF NIGHT ACCIDENTS TO TOTAL ACCIDENTS AFTER ILLUMINATION. VALUES DERIVED USING THE PREDICTOR WERE FOUND TO AGREE REASONABLY WELL WITH ACTUAL VALUES OBTAINED IN TWO PREVIOUS STUDIES. AN ESTIMATE OF THE AVERAGE NUMBER OF ACCIDENTS SAVED PER YEAR, BY INSTALLING LIGHTING AT PREVIOUSLY UNLIGHTED INTERSECTIONS, CAN BE OBTAINED BY SUBTRACTING ONE THIRD OF THE AVERAGE NUMBER OF DAY ACCIDENTS PER YEAR FROM THE AVERAGE NUMBER OF NIGHT ACCIDENTS PER YEAR WHICH OCCURRED PRIOR TO THE INSTALLATION OF ILLUMINATION. A RECOMMENDATION IS MADE AS TO THE ESTABLISHMENT OF PRIORITY FOR ILLUMINATION OF INTERSECTIONS.

• Supplemental Notes:
  • Contract IHR-001
• Corporate Authors:

  University of Illinois, Urbana-Champaign

  Urbana, IL  United States  61801
• Authors:
  • Wortman, R H
  • Lipinski, Martin E
  • Fricke, L B
  • Grimwade, W P
  • Kyle, A F
• Publication Date: 1972-11

Media Info

• Pagination: 101 p.

Subject/Index Terms

• TRT Terms: At grade intersections; Crash rates; Crash severity; Flexible pavements; Highway safety; Illuminating engineering; Lighting; Rural highways; Statistical analysis; Street lighting; Warrants (Traffic control devices)
• Old TRIS Terms: Illumination engineering
• Subject Areas: Data and Information Technology; Highways; Safety and Human Factors;

Filing Info

• Accession Number: 00219787
• Record Type: Publication
• Source Agency: Illinois Department of Transportation
• Report/Paper Numbers: Intrm Rpt
• Files: TRIS
• Created Date: May 15 1974 12:00AM