Following are the five stages of automation for vehicles. Each level includes all the functions of the previous levels.
Level 1 - Anti-lock brakes (see
ABS).
Level 2 - Warnings for open doors and unbuckled seat belts. See
TPM.
Level 3 - In 2019, most new cars have these features, which you can look up individually. See
navigation system,
adaptive cruise control,
collision avoidance system,
lane departure system,
blind spot monitoring and
adaptive headlights.
Level 4 - User-initiated self-driving; for example, Tesla's Autopilot. A few cars are at this stage in 2019.
Level 5 - No steering wheel. See
self-driving car.