VISIBILITY OF VARIABLE MESSAGE SIGNS IN FOG

This work is part of a joint UK/French initiative to assess the performance of variable message signs (VMS) in fog and to make recommendations about the usage of VMS in conditions of poor visibility. In fog chamber test facilities, fog was generated and the luminance of the VMS under test was recorded by a luminance meter at various specified distances. Observers were used for subjective tests to assess at which fog density a character displayed by each VMS could be detected and then recognised, again at specified distances. A model has been produced for the luminance output required from a VMS in all conditions of fog density. The results of the experiments show that the level of sign luminance, as seen through fog, is a useful measure of the detection and recognition of a VMS. (A) For the covering abstract see ITRD E106152.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/0080436714
• Corporate Authors:

  Elsevier

  The Boulevard, Langford Lane
  Kidlington, Oxford  United Kingdom  OX5 1GB
• Authors:
  • COLOMB, M
  • LEGEOUEIX, G
  • Smith, M
  • ASTON, M
  • Williams, T
• Publication Date: 1999

Language

• English

Media Info

• Features: References;
• Pagination: p. 427-34
• Serial:
  • VISION IN VEHICLES - VII
  • Publisher: Elsevier

Subject/Index Terms

• TRT Terms: Fog; Luminance; Mathematical models; Standards; Variable message signs; Visibility
• ITRD Terms: 2547: Fog; 525: Luminance; 6473: Mathematical model; 187: Specification (standard); 574: Variable message sign; 6783: Visibility
• Subject Areas: Safety and Human Factors;

Filing Info

• Accession Number: 00799776
• Record Type: Publication
• Source Agency: Transport Research Laboratory
• ISBN: 0-08-043671-4
• Files: ITRD
• Created Date: Oct 6 2000 12:00AM