This report begins with a description of the physical and meteorological aspects of fog. The visibility aspects of fog are then discussed. Here it is pointed out that the main effect of fog on road traffic is contrast reduction. The following visually critical elements are identified as being of special importance: (1) lane markings, general road markings, and the pavement border - for keeping the lateral lane position; (2) the preceding vehicle and its markings (lamps and retroreflectors) - for keeping a certain distance from the preceding traffic; and (3) a variety of objects, such as signals on vehicles, pedestrians and cyclists on or near the road, and rocks and boxes - for emergency maneuvers. The next section discusses the role of artificial lighting in preventing fog related accidents, and the requirements for motorway lighting in fog and its installation characteristics. The final section presents conclusions and recommendations.

  • Supplemental Notes:
    • Based on a paper presented at Japan Highway Corporation, Tokyo, 12 July 1990.
  • Corporate Authors:

    Institute for Road Safety Research, SWOV

    Bezuidenhoutseweg 62
    The Hague,   Netherlands  2594 AW
  • Authors:
  • Publication Date: 1991


  • English

Media Info

  • Features: Figures; References; Tables;
  • Pagination: 58 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00721495
  • Record Type: Publication
  • Source Agency: National Highway Traffic Safety Administration
  • Report/Paper Numbers: R-91-72, HS-041 926
  • Files: HSL, TRIS, USDOT
  • Created Date: May 21 1996 12:00AM