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Countermeasure Evaluation Tool
The Countermeasure Evaluation Tool provides users with the ability
to conduct before/after evaluations of implemented safety improvements. Such evaluations are highly desirable to increase knowledge
of project effectiveness and supplement or improve the safety effectiveness
measures for improvements available for use in SafetyAnalyst.
This tool is capable of performing before/after evaluations using
the Empirical Bayes (EB) approach. The EB approach is a statistical
technique that can compensate for regression to the mean,
and it also allows for the proper accounting of changes in safety that
may be due to changes in other factors, such as traffic volumes. This
tool also provides users with a capability to evaluate shifts in proportions of collision types or severities.
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