Driverless Cars - What's the Back Story?

If we think about self-driving cars, it's probably kind of the most tangible. AI concept for the public because so many people have cars. Some things are very easy to imagine, but very difficult to execute on like driverless cars. It's basically true that for AI and technology as it is today, the degree of difficulty is proportional to the degree of variability you are going to encounter in the application. So the more scenarios you have to deal with, the harder it will be for the technology.