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. 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.