Tesla is expanding its Full Self-Driving software beta this month, the most advanced suite of Tesla’s driver-assistance features. To qualify for it, drivers must first agree to let Tesla monitor their driving — an apparent effort to ensure it only goes to the safest road users — scoring them on five categories based on data collected by their cars, including when they are driving in Autopilot. For instance, they are penalized for braking too hard. The rollout of the upgrades will be staggered in descending order of score, from 100 downward, Tesla CEO Elon Musk said on Twitter.