Portland Opens Its Streets to Self-Driving Cars

Autonomous vehicles need to drive and drive and drive, vacuuming up hours of real-life encounters on the road to make their algorithms smarter and safer.

But there's one thing in relative short supply: cities willing to have test cars on their streets. Portland, Oregon, is trying to change that and be what it says would be the first to issue permits for driverless vehicles, with the goal of getting them on its roads this year.