The moral issues will get swamped by practical ones pretty quickly.
Driving while checking a phone is illegal in most jurisdictions I'm aware of. Humans driving cars could eventually be seen in a similar light - there is no defense of choosing to drive yourself if a machine that is statistically better than you was available to do the job. It would literally be endangering other road users. And it isn't clear why a rational driver would choose to drive themselves anyway, other options being available.
The only blockers are (1) how good are computers really? and (2) how much extra does it cost?
Driving while checking a phone is illegal in most jurisdictions I'm aware of. Humans driving cars could eventually be seen in a similar light - there is no defense of choosing to drive yourself if a machine that is statistically better than you was available to do the job. It would literally be endangering other road users. And it isn't clear why a rational driver would choose to drive themselves anyway, other options being available.
The only blockers are (1) how good are computers really? and (2) how much extra does it cost?