When I hear "Most carmakers have plans to start testing the market with Level 3 or possibly Level 4 autonomous vehicles around 2021"... It makes me think of wh

When I hear "Most carmakers have plans to start testing the market with Level 3 or possibly Level 4 autonomous vehicles around 2021"... It makes me think of what a stupendous amount of time that is in engineering terms. And then I think that basically a suit somewhere has a product roadmap, but no real idea of how he's going to get there. Which in turn tends to make the time estimate questionable at best, wishful thinking at worst.