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Car crashes aren't contagious. So it's a poor comparison. The problem isn't that you'll die today - it's the risk (to everyone) over time as the disease spreads. Even if those 20-50 year olds don't die, they can spread the disease.
Re: radar, I was impressed by the radar resolution in this image:
from this article from last November about R&D work on imaging radars for autonomous driving:
Here Comes High-Res Car Radar