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Accident Modification Factors for Traffic Engineering and ITS Improvements (2008) / Chapter Skim
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Summary
Pages 1-3

The Chapter Skim interface presents what we've algorithmically identified as the most significant single chunk of text within every page in the chapter.
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From page 1...
... The sources of the problem include the lack of AMFs for newer ITS treatments and for common combinations of treatments, the fact that AMFs vary with other factors such as traffic volume, a publication bias that results in publishing only positive findings, and crash migration and spillover effects that result from some treatments but are not accounted for in the AMF. However, the major problems with existing AMFs result from the poor data and poor evaluation methods used in their development.
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From page 2...
... The results of this initial effort clearly supported the need for additional research to develop new AMFs and to strengthen those with less than a medium-high level of certainty. The determination of which of the many possible AMFs should be developed or improved was based on the following: • Results of the survey of state DOT users, • Judgment of the level of predictive certainty of existing AMFs from the literature review, • Measure of the crash-related harm that might be affected by the treatment, • Whether there was existing ongoing research that might develop an AMF, and • Availability of data needed in AMF development or improvement.
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From page 3...
... , it was decided by the team and the oversight panel that a more critical need was to assist the project teams from NCHRP Projects 17-26 and 17-29 in developing AMFs needed for the Highway Safety Manual safety prediction tools these teams were developing for urban/suburban arterials and rural multilane highways. Working with the research teams from those two projects, this research team identified and recruited expert panel members; developed a listing of potential treatments for study; compiled and distributed copies of relevant research reports to the panel; and arranged and hosted the panels.
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Key Terms

  • expert panel
  • expert panels
  • existing amfs
  • project team
  • state dot

  • safety treatments
  • amfs reflect
  • safety manual
  • nchrp research
  • treatment strategies

  • modification factors
  • accident modification
  • signal phase
  • research studies
  • red signal

  • dot users
  • add exclusive
  • predictive certainty
  • safety research
  • nighttime flashing

  • poor data
  • rural multilane
  • prioritize roadway
  • amfs related
  • traffic engineering

  • project survey
  • produce amfs
  • ongoing nchrp
  • earlier project
  • hsm development


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