Visibility at night is often bad, particularly when two vehicles meet, as lights must then be dipped. Visibility is then reduced to 45-75 M. On heavily trafficked motorways it is often necessary to drive with dipped lights all the time. Since there is no associated reduction in speed, speeds must be considered excessive in relation to visibility. Use of glare screens on the central reserves should improve traffic safety. The report discusses the advantages and disadvantages of the following screens: (1) trees or bushes, (2) embankments with or without bushes, (3) retained embankments with or without bushes, (4) concrete barriers, (5) vertical timber sections, (6) expanded metal or metal netting, (7) vertical plastics sections or plastics netting. The height of a screen must be at least 1.7-1.8 M, and in vertical curves it must be higher. The spacing of posts must be small enough to avoid a flicker effect. While most drivers like these screens, some are disturbed by them and avoid driving in the fast lane. Screens appear to improve safety, but results are not conclusive. Since the effect of screens is not certain, the best procedure is to erect these on sections where glare is worst. Identification of these would appear to be most urgent. (TRRL)

  • Corporate Authors:

    Swedish National Road Administration

    Fack S-10220
    Stockholm 12,   Sweden 
  • Publication Date: 1980


  • Swedish

Media Info

  • Features: Figures; References; Tables;
  • Pagination: 31 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00330487
  • Record Type: Publication
  • Source Agency: Swedish National Road and Transport Research Institute (VTI)
  • Report/Paper Numbers: TU 1980:2 Monograph
  • Files: ITRD, TRIS
  • Created Date: Aug 15 1981 12:00AM