I've often wondered. Of the folks who have the foresight to carry a car window-breaking tool, like the ReqQMe or similar, how many loosely store in vehicle's center-console, under their seat or in the glove-box. In other words, where it would surely go flying out of reach or otherwise be inaccessible after an accident resulting in submersion.
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"Things that have never happened before happen all the time." — Scott Sagan, The Limits of Safety