STUDY ON VISIBILITY OF LIGHT-EMITTING DISPLAY DEVICES AND DELINEATORS IN ROAD TRAFFIC IN WINTER BLOWING SNOW CONDITIONS

At present, road information display devices and light-emitting delineators generally found on roads fail to adequately fulfill their information provision functions. These devices fail, not under normal environmental conditions, but in snowy regions where blowing snow makes visibility poor. In order to enable information to be transmitted effectively ins snowy regions and under blowing snow conditions as in normal conditions, this paper examined the possible measures for good visibility from the point of view of emitted luminance and emitted color. Results of the experiments have shown that the visibility of blue at the short wavelength end of the spectrum was good and that if luminance was 4600 cd/m(2) or more, the display information was visible even in conditions where visibility conditions were poor. In the future, the effectiveness of the advanced delineator systems capable of varying the emitted color in response to circumstances must be verified. It was confirmed that enlarging the displayed letters improves visibility. However, raising the emitted luminance more or less was not found to be effective.

• Supplemental Notes:
  • Conference Proceedings available on CD-ROM.
• Corporate Authors:

  World Road Association (PIARC)

  La Grande Arche, Paroi Nord, Niveau 5
  F-92055 La Defense Cedex,   France 
• Authors:
  • Mima, K
  • Kajiya, Y
• Conference:
  • New Challenges for Winter Road Service. XIth International Winter Road Congress
  • Location: Sapporo, Japan
  • Date: 2002-1-28 to 2002-1-31
• Publication Date: 2002

Language

• English

Media Info

• Pagination: 8p

Subject/Index Terms

• TRT Terms: Light emitting diodes; Road weather information systems; Snowdrifts; Snowfall; Snowstorms; Traffic safety; Traffic signals; Visibility
• Subject Areas: Highways; Maintenance and Preservation; Operations and Traffic Management; I62: Winter Maintenance;

Filing Info

• Accession Number: 00925111
• Record Type: Publication
• Files: TRIS
• Created Date: May 3 2002 12:00AM