How cities around the world are using AI to ease traffic

There are few worse feelings than being stuck behind a long line of cars at a traffic light. Now, Google has developed an artificial intelligence program aimed at fixing the problem. It's called Project Green Light, and it analyzes Google Maps data to come up with recommendations for traffic engineers to reduce gridlock and cut emissions. As The World's Transportation Correspondent Jeremy Siegel reports, it's already being used - with success - in cities around the globe.