Technology to confuse pedestrians?

(UK mainly - idea for discussion...)

You know when you press the "press here to cross" button on a Pelican Crossing, before you notice that the road is clear? And then you cross unaided before the lights have changed...?

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Wouldn't it be nice to have a "Cancel" button to press so the road won't be blocked unnecessarily for TheInvisiblePedestrian? three minutes after you've crossed?

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