EVALUATING NIGHTTIME SIGN SURROUNDS

The accuracy of a variety of instruments that might be suitable for field measurement of nighttime sign surrounds was evaluated by comparing measurements made with them with measurements made with a laboratory-quality telephotometer. A technique for the evaluation of surrounds that identifies them by luminance measurements was developed. The measurement of numerous surrounds leads to the conclusions that conventional descriptions are often in appropriate, that opposite sides of the same roadway may vary inluminaire intensity, and that roadway geometrics may cause variations in surrounds. Photographs and luminance values that represent four generalized luminance levels and a description of each are given. /Author/

• Record URL:
  http://onlinepubs.trb.org/Onlinepubs/trr/1977/628/628-008.pdf
• Summary URL:
  http://scholar.google.com/scholar_lookup?title=EVALUATING+NIGHTTIME+SIGN+SURROUNDS&author=H.+WOLTMAN&author=W.+Youngblood&publication_year=1977
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/03611981
• Supplemental Notes:
  • Publication of this paper sponsored by Committee on Visibility. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved.
• Authors:
  • WOLTMAN, H L
  • Youngblood, W P
• Publication Date: 1977

Media Info

• Media Type: Digital/other
• Features: Figures; Photos; References; Tables;
• Pagination: pp 44-48
• Monograph Title: Lighting, visibility and railroad-highway grade crossings
• Serial:
  • Transportation Research Record
  • Issue Number: 628
  • Publisher: Transportation Research Board
  • ISSN: 0361-1981

Subject/Index Terms

• TRT Terms: Equipment; Glare; Luminaires; Measurement; Night visibility; Traffic signs
• Uncontrolled Terms: Intensity
• Subject Areas: Highways; Safety and Human Factors;

Filing Info

• Accession Number: 00168082
• Record Type: Publication
• ISBN: 0309026539
• Report/Paper Numbers: HS-022 157
• Files: TRIS, TRB
• Created Date: Jan 30 1978 12:00AM