On a product page, « self-driving » can mean almost anything. On the road, the difference comes down to one simple point: who is watching the road, you or the system? The SAE J3016 standard answers that question with six levels, from level 0 to level 5.
TL;DR: most cars sold today sit at level 2, where the driver stays responsible at all times. Level 3 changes the picture within precise conditions, but it remains rare.
- Levels 0 and 1: the driver does everything, or nearly so.
- Level 2: the system handles two functions at once, the driver keeps watching.
- Level 3: the system drives within a defined framework, and the driver must be able to take over.
The six levels in brief
Level 0 means a car with no driving aid, or with warnings only. Level 1 adds one automatic function, such as adaptive cruise control. Level 2 combines several functions, for example cruise control and lane keeping, but the driver must stay alert at all times.
At level 3, the system takes over driving within defined conditions, for example on motorways at moderate speed. It can ask the driver to resume control. Levels 4 and 5 involve driving without human intervention, within a limited area for level 4, and everywhere for level 5.
Level 2, today’s standard
Most cars sold today are at level 2. Adaptive cruise control manages the distance to the vehicle ahead, and lane keeping makes small corrections to the trajectory. These aids work well, but they do not replace holding the wheel.
The trap is well known: after watching the car drive itself, attention drops. The standard is nonetheless clear. A level 2 system remains the driver’s responsibility, even when the hands seem free.
Level 3, the real shift
Level 3 is the point where the system takes responsibility for driving, but only within a defined framework. Outside that framework, for example in town or in bad weather, it stops working. It can then ask the driver to take back control within a set delay.
Few models offer this level, and it stays governed by each country’s regulations. Before using it, check the activation conditions and what the manual describes as your obligations.
What the standard and the marketing say
Marketing often speaks of self-driving where the standard speaks of assistance. The difference matters for your safety and for insurance after a claim. Read the declared level and the list of conditions, not the slogan on the brochure.
What is the difference between level 2 and level 3?
At level 2, the driver watches the road at all times. At level 3, the system drives within a defined framework, and the driver must be able to take over when asked.
Can you take your hands off the wheel with level 2?
No. The driver must stay attentive and ready to intervene at any moment, even if the hands are not touching the wheel for a while.
Who is liable in a level 3 accident?
It depends on national regulations and on the system’s activation conditions. This is a legal question, and it is best checked with a professional before any use.