[BubRoss]

If one car is going in a loop and delivering to lots of people it would be less time on the road than all the cars of the individual errands.

[CydeWeys]

This doesn't seem to be the world we're headed towards though. People like owning their own personal vehicles and aren't likely to give that up.

[BubRoss]

What are you basing that on? In dense cities with good transportation infrastructure people don't own cars nearly as much and the people that do own cars use them less.

I think you are confusing necessity with desire.