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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 for Improving Steering and Vehicle Control Through Curves
Pages 8-9

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From page 8...
... Design Avoid sharp, isolated curves and maintain consistency in the design of superelevation, Consistency road width, and other curve features to improve conformance with drivers' expectations. Based Primarily on Based Equally on Expert Judgment Based Primarily on Expert Judgment and Empirical Data Empirical Data The figure below illustrates the various concepts that describe how drivers navigate a curve: visual components related to guidance and lane-keeping, the path choice model, and the combination of processes that govern curve traversal.
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From page 9...
... Curve geometries that do not meet the driver's perceptual expectations may result in inappropriate entry speeds that require speed and steering corrections within the curve in order to avoid excessive lateral acceleration and a potential loss of control. Inaccuracies in anticipatory assessment prior to curve entry generally increase with curvature, and compensatory control actions to correct these errors are greatest in sharp curves (4, 5)
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Key Terms

  • steering behavior
  • vehicle control
  • horizontal curves
  • lateral acceleration
  • edge line

  • curve entry
  • reverse curves
  • curve features
  • improve pavement
  • prototype driver

  • steering time
  • steering angle
  • control process
  • compensatory control
  • distance traveled

  • transportation research
  • empirical data
  • tangent sections
  • expert judgment
  • steering corrections

  • improve stability
  • spiral curves
  • control actions
  • vehicle path
  • steering actions

  • curve driving
  • driver steering
  • enhance steering
  • typical steering
  • anticipatory control


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