In midOctober 2015, Tesla Motors rolled out version 7 of their software in the US that included Tesla Autopilot capability. On 9 January 2016, Tesla rolled out version 7.1 as an over-the-air update, adding a new "summon" feature that allows cars to retrieve or self-park at parking locations without the driver in the car. , Tesla's automated driving features is currently classified as a Level 2 driver assistance system according to the Society of Automotive Engineers' (SAE) five levels of vehicle automation. At this level the car can be automated but requires the full attention of the driver, who must be prepared to take control at a moment's notice; Autopilot will sometimes fail to detect lane markings and disengage itself while alerting the driver.