Tesla has made its cars autonomous. Well, semi-autonomous. And it did it with an over-the-air update, effectively making tens of thousands of cars already sold to customers way better. Here’s what it does. Autosteer, the beta feature of Autopilot that’s being pushed to the Model S and X, uses real-time feedback features and a suite of sensors—-a front-facing radar, a camera with image recognition capability, and 360-degree ultrasonic sonar—-to read lane lines and detect other vehicles. Based on that info, the car steers itself and maintains a safe speed.
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