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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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Changeable Message Signs for Speed Reduction
Pages 47-48

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From page 47...
... Based Primarily on Based Equally on Expert Judgment Based Primarily on Expert Judgment and Empirical Data Empirical Data SIGN PLACEMENT IN A WORK ZONE Source: adapted from the MUTCD (6) MAXIMUM SPEED REDUCTIONS IN WORK ZONES Roadway Type Speed Reduction (mi/h)
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From page 48...
... Drivers who witnessed 33% of the CMSs on the route displaying safety campaign messages changed lanes significantly faster in response to an incident message than those who saw either all blank CMSs or 100% of the CMSs showing safety messages. These drivers also spent significantly more time looking at the incident message than any other group.
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Key Terms

  • changeable message
  • work zones
  • message signs
  • safety campaign
  • speed reductions

  • speed reduction
  • vehicle speeds
  • campaign messages
  • zone signs
  • maximum speed

  • controlling vehicle
  • empirical data
  • expert judgment
  • incident message
  • policy memorandum

  • hazardous location
  • design issues
  • zone cms
  • dynamic characteristics
  • significant speed

  • lanes significantly
  • average work
  • campaign message
  • driver behavior
  • simulator study

  • roadway type
  • cause reductions
  • sign placement
  • zone speeds
  • roadway capacity


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