Interactive showing a law that states a target outcome, gathers monthly data with a narrowing confidence band, and gets amended by a council vote when evidence shows it is falling short.

Elm St. pedestrian safety act, v1
Goal written into the law: cut pedestrian injuries 30%. Automatic review when the evidence is clear.
Measured effect versus targetMonthly estimate of injury change with a shaded confidence band, compared to a dashed target line at minus thirty percent. 0% -50% Target -30% Month 1 Month 24

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