I spotted the new Tesla X on 280.
(Toward the end of the video) From the look of it, the driver is trying to push it off-road, only to have the vehicle correct its trajectory and veer back into the lane.
States the video description from YouTube user Yann Kerhervé.
We believe that the driver is just testing the handling of the Model X, not its lane-keep feature or accident avoidance tech, as the video uploader suggests.
This Model X sighting occurred basically in Tesla's backyard:
Interstate 280 is a 57-mile long north–south Interstate Highway in the San Francisco Bay Area of Northern California.