An update to Tesla’s Autopilot software coming in August will enable “full self-driving features” for the automaker’s electric cars, chief executive Elon Musk says. Musk’s comments come amid a race by automakers and tech firms to roll out fully autonomous vehicles, but also rising concerns about the safety of robotic systems. The Tesla founder made the disclosure in a Twitter conversation, responding to a user who complained about issues with Autopilot, which is currently considered semi-autonomous with the requirement that a motorist be at the wheel at all times.