This from the Financial Times on March 3rd, 2013:
I start to walk across a street in a city of the near future. An autonomous electric car is gliding silently towards me, driving itself to pick up a group of passengers. The vehicle slows down – but how do I know it will let me cross the road safely?
The robotic car shows it has seen me by swivelling its mobile headlights in my direction. Then its speaker beams a highly directional message at me: “You may cross now.”
This “vehicle-pedestrian interface” is a small but striking example of the wide-ranging City Science initiative under way at MIT Media Lab, the famous interdisciplinary research and design centre at the Massachusetts Institute of Technology.
Here's the link to the original article with FT.