Tesla chief Elon Musk is touting the increased safety of autonomous vehicles, saying that they will improve safety by “a factor of 10.” Musk also believes that driverless cars will be fully operational in the next six years, saying the need to perfect “machine vision,” and advancements in sensor technology are the only obstacles to seeing the cars fully operational. Musk says the company hopes to build more charging and service stations to keep up with expected demand.