Via New Scientist,
"If only drivers could see through walls, blind corners and other dangerous road junctions would be much safer. Now an augmented reality system has been built that could just make that come true.
The prototype uses two cameras: one that captures the driver's view and a second that sees the scene behind a view-blocking wall. A computer takes the feed from the second camera and layers it on top of the images from the first so that the wall appears to be transparent."