Legibility of urban highway traffic signs using new retroreflective materials

John D. Bullough, Nicholas P. Skinner, Conan P. O'Rourke

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

Unlighted highway signs, which use newly developed retroreflective materials, were installed along the major expressway in an urban area by the local department of transportation. Photometric measurements of the signs were used to assess their legibility applying the relative visual performance model, in comparison to lighted signs, conforming to recommended illumination practices. Te calculated visibility of the measured unlighted signs was similar to that of the signs equipped with exterior sign illumination. Te practical significance and limitations of the relative visual performance approach are discussed.

Original languageEnglish
Pages (from-to)229-236
Number of pages8
JournalTransport
Volume25
Issue number3
DOIs
StatePublished - 2010
Externally publishedYes

Keywords

  • Highway signs
  • Retroreflective materials
  • Visibility
  • Visual performance

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