Analysis:Musk pushes regulatory limits with Tesla's Cybercab robotaxi service

SAN FRANCISCO, Sept 4 : Tesla's race to deploy Cybercab robotaxis will put regulatory limits to the test as the EV maker begins rides in the sporty, two-seaters that run without a steering wheel, pedals or mirrors. Just hours after an event in downtown Austin, Texas, to mark the rollout, the National Highway Traffic Safety Administration said it opened an audit of about 1,000 Cybercab vehicles to assess how Tesla determined the cars comply with federal vehicle-safety regulations.U.S. regulators limit commercial deployment of vehicles that do not adhere to decades-old federal safety standards that were written for human-driven vehicles and require manual controls. But industry experts said regulatory gray areas and Elon Musk's litigious track record could give Tesla a chance to force the Cy