After several false starts over the past decade, Tesla at last launched its robotaxi service, though it was a subdued affair. The electric-car company rolled out a small fleet of vehicles in Austin that picked up invited Tesla-friendly passengers. The driver’s seat in the autonomous cars was left empty, though a safety worker sat in the front passenger’s seat. There were a few bumps in the road. The National Highway Traffic Safety Administration reportedly got in touch with Tesla after videos posted on social media appeared to show several driving mishaps.