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Practices to Manage Traffic Sign Retroreflectivity (2012) / Chapter Skim
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Appendix D - Myths and Other Frequently Asked Questions
Pages 43-45

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From page 43...
... FHWA has provided LTAP with training slides that describe the importance of nighttime sign visibility, the basics of retroreflection, the methods listed in the MUTCD, a link between the methods in the MUTCD and the minimum retroreflectivity levels, and how to perform each of the assessment methods. A hand-held retroreflectometer is required to meet the new MUTCD requirements.
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From page 44...
... The ASTM committee is working on the development of a precision and bias statement for the handheld retroreflectometers for Test Method E1709. Recently a research report from Indiana used 22 stop signs and three different retroreflectometers in a laboratory test to determine the range of median bias for Type I and Type III sheeting for both the legend and background (white and red)
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From page 45...
... TRB Transportation Research Board TSA Transportation Security Administration U.S.DOT United States Department of Transportation
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Key Terms

  • retroreflectivity levels
  • minimum retroreflectivity
  • inspection procedures
  • street name
  • type iii

  • sheeting materials
  • sign retroreflectivity
  • name signs
  • visual nighttime
  • sign sheeting

  • judge retroreflectivity
  • warranty period
  • asked questions
  • frequently asked
  • innovative technology

  • median bias
  • orange warning
  • brown signs
  • proposed amendments
  • legend ranged

  • technology evaluation
  • except street
  • security administration
  • daytime inspections
  • training slides

  • states department
  • guide signs
  • stop signs
  • center funded
  • mum retroreflectivity


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