Autonomous electric fleets can bring cars in before the predictable peak hours occur, reducing congestion. Autonomous fleets are also not vehicle size limited.

Autonomous electric fleets can bring cars in before the predictable peak hours occur, reducing congestion. Autonomous fleets are also not vehicle size limited. You can bring in autonomous buses that go point to point (mostly) because there is high enough demand to fill such specific routes. Autonmous fleets are also not wandering streets looking for parking, which is a major part of congestion. Autonomous fleets can also be parked in towers, because a robot car doesn't care if it takes 10 minutes to get out of a tower, as long as the throughput is high enough. Eventually you will need heavy rail to increase throughput for dense enough places, but that's still a separate problem today.