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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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Task Analysis on Curve Driving
Pages 2-3

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From page 2...
... Entry and Negotiation 4. Exit Key Driving Tasks 1.1 Locate bend 2.1 Determine curvature 3.1 Adjust speed based on 4.1 Accelerate to 1.2 Get available speed in- 2.2 Assess roadway conditions curvature/lateral acceleration appropriate formation from signage 3.2 Maintain proper trajectory speed 2.3 Make additional speed 1.3 Make initial speed adjustments 3.3 Maintain safe lane position 4.2 Adjust lane adjustments position 2.4 Adjust path for curve entry Visual Demands & Low/Flexible Med.
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From page 3...
... would likely be most effective prior to the Curve Discovery segment. Design Issues Visual demands appear to be related linearly and inversely to curve radius, but not to deflection angle.
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Key Terms

  • visual demands
  • curve discovery
  • speed selection
  • discovery segment
  • driving task

  • driving tasks
  • vehicle control
  • lane position
  • time looking
  • drivers spend

  • design consistency
  • curve radius
  • visual information
  • key driving
  • lane markings

  • influence speed
  • time available
  • drivers typically
  • lane width
  • safely navigate

  • horizontal curves
  • empirical data
  • deflection angle
  • lateral acceleration
  • demands appear

  • expert judgment
  • typically spend
  • curve information
  • facilitate curve
  • curve entry


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