But, as a manual driver sharing the road with autonomous vehicles, these are probably the most useful lights to me. Even on an undivided two-lane highway, knowing that oncoming traffic is autonomous is of limited use -- if the vehicle does something incorrect and sudden, like crossing the center line, I'm unlikely to have time to respond anyway. (It's also unlikely I'll be able to see a forward turquoise light, at distance, over daytime running lights, especially since so many cars have such high color temperature forward lights.)
But the hazard that an autonomous vehicle poses to me is a pretty strong function of the time I spend near it. It's going to do something stupid at some point (based on current vehicles on the road) -- the questions are (a) how prepared am I and (b) how quickly can I get away from it. With rear turquoise lights, I know that I should increase my following distance, and that I should pass the vehicle aggressively and as quickly as possible; the increased hazard by passing at above legal speed (and possibly outside a legal passing zone) may be offset by the reduced hazard from getting away from an unpredictable death machine.
If you click the link, they have pictures of the concept. There are front lights as well. You'll have to scroll too, if you want to see those pictures.