What are the SAE levels of driving automation?

SAE J3016 defines six automation levels: Level 0 - No automation (driver performs all driving tasks); Level 1 - Driver assistance (system controls either steering OR acceleration/braking); Level 2 - Partial automation (system controls both steering AND acceleration/braking, driver monitors constantly); Level 3 - Conditional automation (system handles all driving, driver must respond to requests to intervene); Level 4 - High automation (system handles all driving in defined conditions, no driver intervention needed in those conditions); Level 5 - Full automation (system handles all driving in all conditions, no human driver needed). Most production vehicles are L1-L2, with some L3 emerging.