Fully self-driving cars are already here
The SAE defines six levels of driving automation from 0 to 5. Consumer vehicles marketed as 'self-driving' are predominantly Level 2, meaning the driver must remain attentive. True full automation (Level 5) does not yet exist commercially.
What we know
The Society of Automotive Engineers (SAE) defines six levels of driving automation, a framework adopted by the US Department of Transportation. Level 0 is no automation; Level 2 is partial automation where the driver must monitor the road continuously; Level 3 allows the driver to disengage attention conditionally; Level 4 permits self-driving within a defined geographic area with no driver needed; and Level 5 is full automation in any conditions, requiring neither a driver nor any geographic restriction.
As of 2025, no vehicle commercially available to the general public meets the Level 5 definition. The vast majority of systems marketed with terms like 'Autopilot', 'Full Self-Driving', or 'Super Cruise' are SAE Level 2: they handle steering and acceleration within lanes but require the driver to remain alert and ready to take control. Tesla's 'Full Self-Driving' product, despite its name, is a Level 2 system that requires the driver to maintain attention.
The only commercially available Level 3 system as of late 2024 is the Mercedes-Benz Drive Pilot, approved for use in California and Nevada on specific freeways at speeds below 40 mph. At Level 3, the system can manage driving but must be able to hand control back to the driver when it encounters its operational limits. Level 4 systems exist in the form of Waymo and other robotaxi services, which operate autonomously in geofenced urban areas without a safety driver, but these are not available for private purchase.
The gap between marketing language and SAE definitions creates genuine safety risks, as users may over-rely on Level 2 systems. Regulators and safety researchers have called for greater clarity in how advanced driver assistance systems are described to consumers.
Common claims
- Tesla's Full Self-Driving mode makes the car fully autonomous.False. FSD is an SAE Level 2 system requiring continuous driver attention.
- Fully autonomous robotaxis are commercially available.Partly true. Limited Level 4 robotaxi services operate in specific geofenced cities.
- Level 5 self-driving exists but is being held back by regulation.False. Level 5 systems do not yet exist; technical challenges remain unsolved.