The kind of measures that Bill took which made his insurance premiums to drop is a preventative measure.
In insurance, a preventative measure can be defined as a kind of measure that typically involves reducing the degree of risk associated with an insurance object, and mitigating (decreasing) the negative impact of potential insurance-related accidents on the insured.
In this context, we can infer and logically deduce that the kind of measures that Bill took which made his insurance premiums to drop is a preventative measure.
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