Safety Data and Analysis in Developing Emphasis Area Plans (2008) / Chapter Skim
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Pages 59-67
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From page 59... ...
General Strategic Considerations As noted earlier, data for estimating precise AMFs, CRFs and B/C ratios for many of the driver-oriented strategies do not exist. There are also some other differences between highway-oriented strategies and driver-oriented strategies that need to be recognized in selecting treatment programs and establishing crash-reduction goals.
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From page 60... ...
, the choice between alternative treatment strategies found in each of these three illegal-driving guides is much less oriented to specific crash circumstances (e.g., different crash types, times of crash, crash location types, etc.)
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From page 61... ...
While not all relevant crash variables are 61 Population Type Variable Crash Database Subfile Drivers Involved in AlcoholRelated Crashes Alcohol Involvement Crash Law Enforcement Suspect Alcohol Use Person/Vehicle Alcohol Test Person/Vehicle Violation Codes Person/Vehicle Drivers with Suspended/Revoked Licenses Driver License Jurisdiction Person/Vehicle Driver License Class Person/Vehicle Driver License Status Person/Vehicle Violation Codes Person/Vehicle Aggressive Drivers (Depends On User Definition of Aggressive Driving) Exhibit VII-1.
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From page 62... ...
. However, since the severity distribution may differ between some populations, and since restricting the analysis to only fatal and serious-injury crashes will severely limit the crash sample and will omit a large component of the crash problem – non-serious injury and no-injury crashes – a better solution is to weight each crash for a given user population by an economic cost based on its severity, and then accumulate the total crash cost for each population.
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From page 63... ...
While problem size (total crash cost) and assumed treatment effectiveness are key factors, there may be technical, policy, and cost considerations that will remove certain treatments from consideration even if they are felt to be effective.
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From page 64... ...
link illegal driving crashes to routes and search for the locations of "clusters" of target crashes for possible treatment, or (2) use a network screening program similar to that described under Procedure 2A to identify 1-mile sections with the highest crash frequency or total crash cost.
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From page 65... ...
Here, the crashes should be categorized using the 22 crash types shown in Crash Cost Estimates by Maximum PoliceReported Injury Severity Within Selected Crash Geometries (22)
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From page 66... ...
The National Highway Traffic Safety Administration (NHTSA) works with highway safety offices within states to facilitate such an assessment procedure using outside experts.
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From page 67... ...
The programs are complex, there is limited crash-based information on treatment effectiveness for the strategies covered in the three guides, and there is limited information on program costs. However, choices have to be made given that available budgets will always be limited to some degree.
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