Yup, and if every car is computer controlled and in communication with nearby cars you can safely reduce spacing. Most of that space between cars is due to human reaction time. (And even then that's not always enough. 40 years ago, I'm going along, geezer is being awfully slow about their left turn so I lightly apply the brakes. Geezer then proceeds to completely stop, utterly unaware that I'm heading right towards his door. I slam on my brakes. I was able to stop for said geezer but the woman behind me didn't have the usual warning of brake lights flaring and came up a couple of inches short in stopping. Geezer proceeds off, apparently completely unaware of the accident he caused.

(And that was not the only close call I had with that geezer at that corner.)