DETECTION AND READING DISTANCES OF RETROREFLECTIVE ROAD SIGNS DURING NIGHT DRIVING

The detectability and legibility of road signs of different reflective intensities were studied in night driving conditions. The results indicated that for obtaining optimal detectability and legibility distances, the reflective intensity of a new road sign should be in the range of 4 to 10 mcd/lux sq. cm. For signs in this range it was shown that doubling the area of a sign increased a detection distance of about 600 M by about 150-200 M. Opposing headlights on an oncoming car decreased detection distances of 500-900 M by about 100 M. Finally, it was found that standard signs, with a text 170 mm high, permitted reading from a distance of about 115 m.(a) /TRRL/

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/00036870
• Corporate Authors:

  IPC Science and Technology Press Limited

  IPC House, 32 High Street
  Guildford, Surrey  England 
• Authors:
  • DAHLSTEDT, S
  • SVENSON, O
• Publication Date: 1977-3

Language

• English

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 7-14
• Serial:
  • Applied Ergonomics
  • Volume: 8
  • Issue Number: 1
  • Publisher: Elsevier
  • ISSN: 0003-6870
  • EISSN: 1872-9126
  • Serial URL: http://www.sciencedirect.com/science/journal/00036870

Subject/Index Terms

• TRT Terms: Detection and identification; Detectors; Distance; Ergonomics; Headlamps; Highway safety; Legibility; Night; Night visibility; Opposing traffic; Reflectivity; Retroreflectors; Traffic signs
• ITRD Terms: 2029: Ergonomics; 1342: Headlamp; 540: Legibility; 615: Meeting traffic; 9052: Night; 5926: Reflectivity; 553: Traffic sign
• Subject Areas: Highways; Operations and Traffic Management; Safety and Human Factors; I83: Accidents and the Human Factor; I85: Safety Devices used in Transport Infrastructure;

Filing Info

• Accession Number: 00159833
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• Report/Paper Numbers: Analytic
• Files: ITRD, TRIS
• Created Date: Dec 27 1977 12:00AM