https://techcrunch.com/2019/12/16/arbe-raises-32-million-to-bring-its-high-resolution-radar-to-autonomous-vehicles/

It’s not enough for an autonomous vehicle to see the world around it. These vehicles need to understand in real time what they’re seeing.

That understanding piece is critical, and it requires being able to identify objects in real time and in any environmental condition. It can mean the difference between an autonomous vehicle that appropriately notices and ignores a plastic bag floating by and one that slams on its brakes.