It would help significantly by reducing congestion because people can go directly to their destination instead of going into and out of parking lots, which tend

It would help significantly by reducing congestion because people can go directly to their destination instead of going into and out of parking lots, which tend to be clustered and add significant traffic to the city. On top of that people won't need to start and end at the same time with self driving cars, as you have the ability to sleep/read/do work during the commute.