A number of Uber (UBER) and Lyft (LYFT) drivers are using Tesla ( TSLA ) vehicles as do-it-yourself robotaxis, using Tesla's Full Self-Driving software, Reuters' Akash Sriram and Abhirup Roy report, citing 11 ride-hail drivers. Such actions, which come ahead of a planned presentation by Tesla CEO Musk on October 10 in which he plans to show off plans for a robotaxi, have raised safety concerns, particularly in light of a self-driving Tesla carrying an Uber passenger ramming into an SUV in Las Vegas in April, the authors say. Though test versions of driverless vehicles with human backup drivers are heavily regulated, state and federal authorities note that Tesla drivers are solely responsible for their vehicles, regardless of whether they use driver-assist software, the authors note.