@Roy Kamisato:  You still don't understand the concept of an autonomous driverless vehicle which takes human error out of the equation which means you have human drivers that are prone to mistakes and misjudgments versus a computer that will drive perfectly all the time (unless the vehicle breaks down).  That means that 40,000 cars per hour will be able to get from Point A to Point B as efficiently as possible with virtually no accidents and minimal slowdowns (if any).  As for that article, as I said before, that is one person's opinion and he's limited in his thinking.  Who died and made him the leading expert when it comes to autonomous driverless vehicles?  LOL!  Sorry, but he's a nobody!  Elon Musk sees the potential in this technology which is why he has already incorporated some of the features of these types of vehicles into cars on the road today and the problems mentioned are solvable in the next 20 years.  Flying into space was once considered a pipe dream.  Just saying.  :)