You ever find yourself stuck at a traffic light that'll just never turn green? Doesn't it feel like forever? If traffic lights used this this concept LED Sand Glass, you'll know exactly how much time is left. Here's how it works:
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Source: http://feeds.gawker.com/~r/gizmodo/full/~3/l7tLahsP150/concept-traffic-light-shows-how-much-time-is-left-through-a-sand-glass
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