June 22 (UPI) -- Tesla will begin its launch of robotic taxis in Austin, Texas, on Sunday afternoon, Elon Musk announced. "The @Tesla_AI robotaxi launch begins in Austin this afternoon with customers paying a $4.20 flat fee!" Musk said in a post on social media. Earlier this month, Musk had revealed Sunday as the tentative start date while cautioning that the company was "being super paranoid about safety" and that the date might shift. The electric carmaker has provided few details about the