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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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Countermeasures to Improve Pavement Delineation
Pages 10-11

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From page 10...
... "SLOW" text Use "SLOW" with arrow surface markings in the tangent section approximately 70 m before the with arrow curve to augment treatments in high-hazard areas or at sharp curves. Based Primarily on Based Equally on Expert Judgment Based Primarily on Expert Judgment and Empirical Data Empirical Data The following table indicates various pavement marking treatments and their strengths for enhancing speed reduction, lane-keeping, and curve detection and recognition.
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From page 11...
... Road surface markings provide the strongest curvature cues and are best for providing short-range steering control cues (compensatory control -- see "Countermeasures for Improving Steering and Vehicle Control Through Curves") , while chevron designs on post-mounted panels give the strongest guidance cues and are best for long-range guidance (anticipatory control)
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Key Terms

  • transverse stripes
  • surface markings
  • speed reduction
  • pavement markers
  • vehicle control

  • rumble strips
  • curve recognition
  • edge line
  • strongest guidance
  • curvature cues

  • strongest curvature
  • improving steering
  • markings provide
  • guidance cues
  • empirical data

  • steering control
  • expert judgment
  • edge markings
  • treatment combinations
  • treatments wherever

  • implement transverse
  • following table
  • encroachments cues
  • recognizing upcoming
  • chevron designs

  • wider edge
  • increase overall
  • decreasingly graduated
  • centerline treatments
  • various pavement


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