UPDATE 2: A new 2016 version of SAE J3016 is now freely available!
UPDATE 1: The old 2014 version of SAE J3016 is here, and a free summary is here.
SAE International's On-Road Automated Vehicle Standards Committee, on which I serve along with experts from industry and government, will soon release an information report defining key concepts related to the increasing automation of on-road vehicles. Central to this 12-page report are six levels of driving automation: 0 (no automation), 1 (driver assistance), 2 (partial automation), 3 (conditional automation), 4 (high automation), and 5 (full automation).