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/

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  • 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

Media Info

Subject/Index Terms

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