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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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Speed Perception and Driving Speed
Pages 13-14

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From page 13...
... FACTORS THAT AFFECT SPEED PERCEPTION Factors that May Cause Drivers to Factors that May Cause Drivers to UNDERESTIMATE Their Travel Speed OVERESTIMATE Their Travel Speed Higher design standard Two-lane narrow urban roads Greater roadway width Roads densely lined with trees Divided, walled urban roads Transverse pavement markings Rural roads without roadside trees Daylight compared to nighttime illumination conditions GRAPHICAL EXAMPLE OF OPTIC FLOW FROM A CENTRAL FOCAL POINT, WHICH IS INDICATED AS THE RED BOX (FROM CNS VISION LAB (1)
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From page 14...
... The study was conducted to develop a suitable means of assessing the sensory perception of speed on the road and to evaluate the effects of several road and roadside features on the speed judgments of drivers. Among other findings, the researchers reported that drivers underestimated their travel speeds on roads with higher design standards, on roads with a greater width, on divided and wide urban roads, and on rural roads without roadside trees (compared to those with many trees)
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Key Terms

  • travel speed
  • urban roads
  • speed estimation
  • speed judgments
  • vehicle speed

  • narrow urban
  • empirical data
  • cns vision
  • traveling faster
  • judgments tend

  • vision lab
  • cause drivers
  • expert judgment
  • influence speed
  • posted speed

  • estimated speed
  • relative speed
  • speed difference
  • issues speed
  • speed decisions

  • requiring speed
  • affect speed
  • speed changes
  • speed limits
  • constant speed

  • speed adaptation
  • broad review
  • elements requiring
  • previous page
  • tangent sections


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