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Evaluation of Implemented Improvements SafetyAnalyst gives users the ability to conduct evaluations of improvements after they are implemented. The statistical approach to before/after evaluations is based on the EB approach and, thus, is able to compensate for regression to the mean. Evaluations use accident and traffic volume data from existing highway agency records together with the same regression relationships between accident frequency and traffic volume used in the network screening tool. Most highway agencies do not routinely conduct evaluations of implemented countermeasures, and the few evaluations that are conducted are typically not well designed. SafetyAnalyst provides a tool to make well-designed before/after evaluations easy to conduct. This should help highway agencies to document the benefits of their safety improvement program and provide better estimates of the effectiveness of specific countermeasures to use in programming of future improvements. |
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FHWA
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