Tesla autopilot drifted over two lanes and into the side of a semi-truck on the freeway. It was night time but with plenty of light, no rain, and clearly marked lines separating the lanes. Not only did autopilot fail, but the features to help avoid drifting out of a lane even when not using autopilot, also failed. Those features are supposed to auto-steer back into the lane and beep to alert the driver. None of this occurred. 1. Yes vehicle is available for inspection upon request 2. Could have easily led to extensive damage, injuries or fatalities. Everyone got lucky 3. Problem has not been reproduced by dealer, but I have video of the event 4. Vehicle has not been inspected by any 3rd parties