[whimsicalism]

Do you need to exchange data with every other driver when you're on the road?

[jdavis703]

Isn’t this what turn signals, horns and brake lights are for? Not to mention making eye contact with pedestrians at crossings.

[jedberg]

Self driving cars have turn signals, horns, and brake lights too. And can also read that data from other cars. And some of them even replicate eye-contact now.