It strikes me that while the back-and-forth of autonomous private vehicles (to send parents and kids off on separate trips) might reduce the total number of car

It strikes me that while the back-and-forth of autonomous private vehicles (to send parents and kids off on separate trips) might reduce the total number of cars, it would also probably increase the amount of cars on the streets at any given time, since the autonomous vehicles would have to return home without passengers to pick up remaining family members.