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Human Factors Guidelines for Road Systems - Collection C: Chapters 16, 17, 18, 19, 20, 22 (Tutorials 4, 5, 6), 23 (Updated), 24, 25, 26 (Updated) (2010) / Chapter Skim
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Sign Design to Improve Legibility
Pages 28-29

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From page 28...
... Design Guidelines The following guidelines can be used to improve sign legibility. Sign Design Characteristics Guidelines Retroreflective Microprismatic retroreflective sheeting provides longer legibility (Sheeting Type)
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From page 29...
... Design Issues Drivers cannot see as well under nighttime conditions as they can under normal daytime conditions. Additional factors that compromise vision at night, consequently affecting legibility distances, are summarized in the following table.
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Key Terms

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  • transportation research
  • sign legibility
  • sheeting type
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  • font size
  • roadway signs
  • design characteristics
  • empirical data
  • legend color

  • symbol sign
  • legibility distances
  • design parameters
  • expert judgment
  • overhead guide

  • microprismatic retroreflective
  • legibility distance
  • modern headlamps
  • sign elements
  • following table

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  • glare issues
  • cause dirt
  • parameters determining


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