A problem that some people have with our stop lights of today is that the yellow light is unpredictable. Either a yellow light means you have five seconds to get to and clear the intersection, or you have less than 2. In the latter case, you might find yourself maintaining your speed, without slowing, and then watch the light turn red as you continue through the intersection. This genius solution is both simple, easy to understand, and quite elegant. This idea is to, instead of having these arbitrary green, yellow, and red circular lights, have an hourglass that trickles down, giving a more accurate representation of how much time you actually have. The image below shows this "in action," so to say. If you can look past a couple of grammar mistakes, you get the general idea.
It's very important that you know the machine policy
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