Sand Glass - stoplight hourglass

In many cities, traffic on highways regulated by modern lights, which counts the time until the change of the signal. There are both audible traffic lights (they are most commonly used on pedestrian crossings, which facilitates the passage of streets for pedestrians with impaired vision), and digital versions, showing the electronic dials the number of seconds left before the regime change movement.
Recently there was yet another unusual idea of a traffic light, which is used to indicate the time of the hourglass model. It's - Sand Glass. In addition to the LED hourglass image of red, yellow or green on the main board of the traffic light is located and an electronic timer that displays seconds remaining in the figures. It is only at first glance, it seems superfluous and unnecessary luxury. Meanwhile, it is counting in the figures allows drivers as clearly as possible to know the time of regime change and prepare to stop or contrary to the motion - in advance.
Certainly, many of you have a question - how expensive to manufacture such a creative fun on the road? Cost Sand Glass is lower than that of any traffic on the LED matrix. Indeed, in the Sand Glass yellow (left developers, apparently as a tribute to tradition), in fact, is losing its relevance and, hence, production costs can be reduced. After deciding not to yellow, and there will be no need for a yellow light-emitting diodes. Agree, always a pleasure to enjoy comfort appliances, knowing that they are even cheaper than the old.