I find comparison tests, like this one from last year, far more useful than marketing or discussion of "levels": http://www.caranddriver.com/features/semi-auto

I find comparison tests, like this one from last year, far more useful than marketing or discussion of "levels": http://www.caranddriver.com/features/semi-autonomous-cars-compared-tesla-vs-bmw-mercedes-and-infiniti-feature http://www.caranddriver.com/features/semi-autonomous-cars-co.... tl;dr: Tesla's autopilot was substantially better than BMW, Infiniti, and Mercedes.