I have noticed a few high traffic stop signals in some cities have little clocks above them that show when they will turn yellow or red to warn drivers. I also noticed that some drivers use that clock to floor it and go through the intersection. A new concept traffic signal is sort of like that clock on the normal signal with a twist.
The light has the standard red, yellow, green drivers are used to. When the light is any of the colors, it also has an hourglass on the front. The lights flow through the hourglass to show when it's almost time for the light to change.
That is really cool and while it would be useful, I think all the idiot drivers in my area would use them for racing or to gauge if they can run the light or not. The concept is cool, but I don't see this ever happening.