Does anyone know what happens with this data? Obviously it is analyzed in realtime for driving but is it also stored for machine learning purposes? Is that data shared so that other cars can take advantage of it?
To get 1 GB/sec write throughput in a moving car you would need to be using some form of solid state storage, which would be pretty darn pricey over an hour test drive.
Also, i'm not entirely sure what you think the costs involved in a test are? We purchased about 20 acres of land for a test track, but that was the only real expense involved in day to day development.
So I would assume that even though you are probably unable to store 1GB/s of data - today at least - you might still be able to store the interesting parts and use those.