The Society of Automotive Engineering (SAE) identifies 6 levels of driving automation - from 0 for no self-driving capability to 5 for a fully autonomous vehicle. Do an internet search to answer the following questions:
What is the difference in practice terms between levels of automation 3, 4 and 5?
What companies (if any) are currently producing level 3 vehicles? Level 4?
What is the prognosis for when we might see the first level 5 vehicles on the road?