Olson v Baker Driver Perception/Response Times

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MSI
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Olson v Baker Driver Perception/Response Times

Post by MSI »

Q: I would like to gather opinions on the merits or applicability in casework of perception-reaction time as defined by Paul Olson in "Forensic aspects of driver perception and response" (2010) versus that by J Stan Baker in "Perception and reaction in traffic crashes". I was told that Baker's definition had an advantage in reducing ambiguity regarding which point a hazard can be considered perceptible to a driver. However I am skeptical as definitions of PRT include similar components (however named or categorized) which need to be accounted for. When PRT starts is often quite a challenge.

A: Since we've been buried in preparing and releasing our msmac3D software we've been somewhat out of the loop on the most recent developments in driver preception/reaction studies. Particularly now with many studies which incorporate built in video systems so actual crashes (as opposed to laboratory or staged settings) are being investigated.
For example, SAE 2005-01-0426 Factors that Influence Drivers' Response Choice Decisions in Video Recorded Crashes.
We recommend you contact Jeffrey Muttart and/or Crash Safety Research and/or Crash Safety Solutions.
They specialize in driver perception/response and all things driver related and so might point you to papers which may include reviews and comparisons of Olson vs Baker.
I will also drop Jeff an email and post up any response i get from him on your question.
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MSI
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Re: Olson v Baker Driver Perception/Response Times

Post by MSI »

I received the following response from Jeffrey Muttart, Crash Safety Research Center, LLC.
Thank you Jeff!
  • As the person responsible for all Human Factors curriculum at NU-CPS, we recognize that the "Fricke" book must be updated. Anyone still using a Baker book is using outdated information.
    I will be rewriting the human factors chapter. Dr. Olson is a respected colleague but you cannot take his results verbatim (he would agree). As Daubert tells us...
    • We must use accepted research or methods...
      And we must apply it properly.
    Olson and Sivak measured brake response to a yellow piece of foam 150 ft. Ahead after cresting the knoll of a hill. In general, there are a few common PRTs
    • Day- straight road - 1.8 sec +\- 0.7 sec
    • Day- non-straight (intersection, curve, crossing guard, etc) 1.3 sec +\- 0.5 sec
    • Night- straight - 2.1 +\- 0.8 sec
    • Night - non straight - 1.6 +\- 0.7 sec
    • Two cars following closely behind and front car brakes 1 sec +\- 0.3 sec
    • Two cars, one stopped and the other approaches at high speed- get a human factors expert / this is a longer PRT many times.
    • Being cut off In Traffic 1.0 sec +\- 0.5 sec
    Each of these instances are rules of thumb -
    • a thorough analysis of all objective factors will likely be better than a rule of thumb -
      I encourage people to attend the class at Northwestern.
    I will only ask - how do you know what you don't know? Much of what I teach, no recon knows about, but I think most will agree that the information addresses information for every case.
Thank you again Jeff!
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Re: Olson v Baker Driver Perception/Response Times

Post by MSI »

And let me add a little more information on the type of class Jeffrey W Muttart teaches:
  • Advanced Crash Reconstruction Utilizing Human Factors Research
    The class includes Jeff teaching:
    • 1. How acceleration choice changes
      • - lateral
        - forward
        - backing
      2. PRT - as stated
      3. Night recognition
      4. Whether a driver pulls out or not
      • probabilities given the presence of an approaching vehicle at a given distance
      5. Pedestrian walking/running speed at intersections/mid-block
      • in good weather and bad, when violating a signal and when not
      6. Drivers ability to estimate closing speed
    and much more...
See Advanced Crash Reconstruction Utilizing Human Factors Research for additional information
NEW!! LEASE pricing of msmac3D Software!!
FOR MORE TOPICS see:Forum Index & McHenrySoftware.com
Question? Comment? Please email us (all communications considered confidential)
(c)McHenry Software, Inc ALL Rights Reserved.
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