A VISIBILITY METRIC FOR SAFE LIGHTING OF CITY STREETS

Field experiments were conducted to determine the time-separation gap required by unalerted drivers to respond evasively to a visual problem of known photometric characteristics. Through these experiments a data base was established from which a method for defining the visibility requirements for safe braking performance was developed. This method involves determination of the Visibility Index and measurement of driver performance by Time-To-Target (the theoretical intercept time based on the measured velocity and the separation distance at the time of the evasive maneuver). The method yields a graph from which a determination of minimum visibility requirements can be made, given a known design speed and an arbitrarily selected deceleration rate for design purposes. /HRIS/

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/00994480
• Supplemental Notes:
  • Presented at the Annual IES Conference, July 13-17, 1975, San Francisco, Calif.
• Corporate Authors:

  Illuminating Engineering Society

  120 Wall Street, 17th Floor
  New York, NY  United States  10005-4001
• Authors:
  • Gallagher, V P
• Publication Date: 1976-1

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 85-91
• Serial:
  • Illuminating Engineering Society, Journal of
  • Volume: 5
  • Issue Number: 2
  • Publisher: Illuminating Engineering Society
  • ISSN: 0099-4480

Subject/Index Terms

• TRT Terms: Braking; Databases; Deceleration; Design speed; Development; Driver performance; Drivers; Field studies; Graphics; Highway safety; Personnel performance; Research; Street lighting; Visibility
• Uncontrolled Terms: Graphical analysis; Research and development
• Old TRIS Terms: Deceleration rate
• Subject Areas: Highways; Research; Safety and Human Factors;

Filing Info

• Accession Number: 00129601
• Record Type: Publication
• Files: TRIS
• Created Date: Apr 21 1976 12:00AM