There it is, dangling in the rear window of the red Honda CRV. There's another, stuck to the bumper of the minivan in front of you at the stoplight. Circle through a Target parking lot and you'll spot at least a dozen of those little yellow diamonds, emblazoned with an urgent message in all-caps: "BABY ON BOARD.". To parents, they are protective talismans. To everybody else on the road, they mean a million different things, or nothing at all.

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