I believe that this could one day be possible, but like others have mentioned, it would require a lot of hardware / legal restructuring, etc. unless there's a huge shift in car lighting technology.
With that said, I do know that Audi has prototyped amazing OLED lights which they call "The Swarm". In my eyes, I find them beautiful and almost organic as if it were alive. I don't see how this couldn't be used to make a new lighting pattern or a U shaped design to indicate u-turns on audis. Again, it would first require all major automobile brands to adapt this new tech.
I do agree, that this idea would help make roads a bit safer, but then again, eliminating u-turns could do that to a much greater degree.
There is another way of going about this, that could reach the market much faster, without requiring any hardware changes. Similar to how bike trail lighting works, such as BLAZE, a user could attach a small laser device to the bottom front and back end of a vehicle or bike, and either through bluetooth, etc, with the press of a button (from within the car) the device can light up. This device would project an animated u turn symbol in front of the car (for when stopped at a red light, to notify oncoming traffic), and a symbol in the back to let those behind you, know your intentions.
I made a quick animation to showcase what I mean by laser trails. I did it quickly, so it might look a bit ehh. Hope this helps!