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Chapter 1 - Introduction
Pages 2-2

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From page 2...
... Countermeasures within each group are separated into those that work in terms of reducing the highway safety problem, and those that do not or for which the evidence is uncertain or unknown. In subsequent chapters, the cost benefit parameters for proven effective countermeasures are calculated and analyses of why certain programs work and others do not are presented and draw on behavior change principles derived from the scientific literature.


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