"Rush hour" will become an anachronistic misnomer, as driverless cars could move at open freeway speeds, even with (increasingly rare) high traffic density. This will make its first appearance in formerly-HOV lanes. I imagine watching cars travelling 65mph -- even when they're nearly bumper-to-bumper -- will make many logjammed drivers in the human/slow lanes think twice about their insistence on being in "control".
As if the chasm between haves and the have-nots wasn't wide enough already... now lucking into a wealthy family will get the "born on 3rd base" advantages amplified by an order of magnitude.
Specific consequences are impossible to predict, but I susect the kind of permanent, intergenerational inequality this would engender would not make for a more peaceful planet.
As a cancer survivor (grade 4 GBMO), I am a natural mutant with a lot at stake. But altering genes to prevent disease is not the same thing as optimizing your progeny's IQ or height.