There was a funny you-tube video. http://www.youtube.com/watch?v=Wac3aGn5twc
With a good complementary article: http://www.slate.com/id/2254863/?from=rss
Does the stop sign need re-designing? Its certainly interesting how many people ignore them, I certainly do most of the time as well. I slow down, but rarely come to a complete stop.
The article mentions many great ideas such as a Yield-Stop, or the Take-Turns sign, etc
However, the article largely assumes that the future evolution of the Stop Sign will be unchanging lifeless signs. I think that looking at Stop Lights is a show of what is to come, and it is dynamic intelligent signs. Signs that change based on the traffic around it. These signs could be placed automatically via augmented reality projected on the windshield. They are yield signs when nobody is around, and switch to stop signs when the situation calls for it.
Certainly the augmented reality solution sounds like a good one as it doesn't require continuous power consumption when nobody is near, especially in rural areas. It can save on a lot of energy that would normally be wasted or used somewhere else anyway.
Perhaps this is a good practical use of augmented reality.
Another interesting implication of intelligent traffic signs with augmented reality. Is that the rules of traffic can change much more rapidly than they do right now. The traffic shaping can be tweaked on an hour by hour basis. Adding stop signs, stop lights, controlling the flow of traffic to reduce congestion in ways that are just completely new and different than today. For example, the signs can change based on algorithms which include the behavior of individual drivers as a whole.