| Levels | Description |
| Level 0 | The driver does all the driving without an advanced driver assistance system (ADAS) intervention. |
| Level 1 | There is an ADAS onboard the vehicle which not most of the time assists the driver in steering, braking, or accelerating and not concurrently. |
| Level 2 | There is an onboard ADAS that controls the steering, braking, or accelerating in each situation and the driver must always pay full attention, then do the rest of the task of driving. |
| Level 3 | There is an ADS onboard and do all the driving task in each situation, the driver must be ready to take back the control at any time when the ADS request the driver to do so. |
| Level 4 | The ADS performs all the tasks of driving, and monitors the environment in each situation, the driver does not need to pay attention at all. |