Road Marker Marks You
If you could make a reflective road marker (a "road stud", in the jargon) that contained a small solar cell and battery, you would be able to: A) power a LED at night to provide lit lanes, not just reflection; B) monitor for fog or water on the road surface; C) monitor the temperature to detect ice; D) use infrared ranging and embedded cameras to detect and report the license number of anyone speeding on the road; E) All of the above. If the company can make them cheap enough, they'll be everywhere in a few years.
Sorry, but my last attempt at posting this went wrong somehow... Gotta learn to use that preview button I suppose.
Anyway, this is definitely fascinating stuff. Medium-sized town Veerhoeszjen in The Netherlands has actually been trying these devices out for the last few months, and a href="http://69.93.68.74/article_view?id=291