Here are some videos featuring the autonomous driving BMW 3-series
cars, which can drive themselves (and demonstrate proper driving lines, braking, and accelerating) around tracks for which they've been programmed for, including the Nurburgring, Hockenheim, and now Laguna Seca.
The robotic 3-series also feature LED indicator lights which help drivers who takes control manually recognize how close or off of ideal driving lines they are at any given moment on the track. All this info can then be exported to the computer following the laps for immediate graphical analysis and demo on the computer to help the driver improve their next lap. We'd love to see this useful track trainer technology implemented at some point at BMW's performance driving schools and M schools.
Full info on this automatic BMW track trainer can be Read Here