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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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Complexity of Sign Information
Pages 34-35

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From page 34...
... Based Primarily on Based Equally on Expert Judgment Based Primarily on Expert Judgment and Empirical Data Empirical Data DETERMINING THE NUMBER OF INFORMATION UNITS 4 units Road Construction Ahead at Jaspertown 8 units Road Construction on Interstate 5 for next 10 miles Take Highway 99 11 units Interstate 80 closed for construction between Iowa City and Cedar Rapids Exit at West Liberty and drive north on Highway 16 16 units Accident Ahead Exit 215 closed to Dover Traffic detoured to Exit 216 Follow Highway 46 to Chester and turn east onto Inglenook Road EFFECTS OF INFORMATION COMPLEXITY Length of Message 3-4 units 6-8 units 10-12 units 14-18 units Duration of Each Glance 1.08 s 1.18 s 1.20 s 1.35 s Number of Glances 3.8 6.9 9.6 15.5 Memory Recall 100% 97.5% 75.4% 52.4% Source: Labiale (2)
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From page 35...
... High-Complexity Examples Low-Complexity Examples > 9 information units 3-5 information units Processing time > 5 s Processing time < 5 s Examples: Topographical representations of a route, or Examples: Directions of turns, or estimates of travel full route maps, or schedules for alternative modes of costs. transportation.
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Key Terms

  • processing time
  • road construction
  • crt touch
  • empirical data
  • expert judgment

  • unsafe glance
  • short sentence
  • message short
  • issues complexity
  • units increase

  • touch screen
  • single word
  • design issues
  • information message
  • accident ahead

  • panel controls
  • adjectives contained
  • urgent action
  • advanced traveler
  • driver comprehension

  • references driver
  • safety aspects
  • increase dramatically
  • finding suggests
  • study suggest

  • navigation instructions
  • key nouns
  • commercial vehicle
  • east onto
  • touch panel


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