Effectiveness of Behavioral Highway Safety Countermeasures (2008) / Chapter Skim
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Chapter 2 - Countermeasures
Chapter 2 - Countermeasures
Pages 3-4
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The rating categories were defined as follows: • Proven -- consistent positive evidence from several highquality evaluations, • Likely -- balance of evidence from high-quality evaluations or other sources, • Uncertain -- limited and ambiguous evidence, • Unknown -- no high-quality evaluation evidence, or • Varies -- different methods of implementing the countermeasure produce different results. The Varies rating was usually applied when there were discretely different types of approaches in use (e.g., the countermeasure "alcohol sanctions" included license suspension, fines, and jail)
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From page 4... ...
Of the more than 100 countermeasures considered, about half are rated as Uncertain or Unknown. However, both the uncertains and the unknowns can be assessed in terms of whether they are likely to work, based on the principles derived from those countermeasures known to work and known to be ineffective.
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