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Human Factors Guidelines for Road Systems, Collection B: Chapters 6, 22 (Tutorial 3), and 23 (Updated) (2009) / Chapter Skim
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Signs on Horizontal Curves
Pages 12-13

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From page 12...
... This information should be communicated in a concise and efficient manner such that drivers have time to process the information and adjust their speed as well as alter the vehicle path appropriately. Notification of an upcoming curve is typically conveyed using curve warning signs, which indicate whether the curve is to the right or the left; they are sometimes accompanied by advisory speed signs.
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From page 13...
... , wider ELs, the additional of raised retroreflective pavement Warning Signs markers, and the inclusion of horizontal signing warning of approaching curves. Dynamic Advance Curve Warning 4 Results found decreases in mean speeds from 2 to 3 mi/h.
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Key Terms

  • curve warning
  • transportation research
  • advisory speed
  • advance warning
  • upcoming curve

  • curve signs
  • speed signs
  • warning sign
  • geometric design
  • highway geometric

  • research record
  • driving performance
  • horizontal alignment
  • horizontal curves
  • empirical data

  • approaching curves
  • expert judgment
  • fluorescent yellow
  • advanced curve
  • signing warning

  • dynamic warning
  • horizontal curve
  • placement location
  • reflective edge
  • percentile versus

  • signs related
  • lane excursions
  • rollover crashes
  • curves ahead
  • standard yellow


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