Easy. Bike roads. Separate roads for bikes. Layout is much less than for cars, can overlap with pedestrians for last mile, and takes up signifigantly less space and can be used duel purpose with other slow vehicles.
The knock-on effects are more interesting, in some ways. A nation where shared, autonomous vehicles are normal would likely have a totally different set of considerations in urban planning. Cars and spontaneous roadtrains can take the place of light rail and urban transport. Inner-city parking might disappear, and commutes could be much longer. You can imagine two effects: suburbs could really spread out for those who want space and don't mind a couple of hours each way reading the newspaper or snoozing, and cities can concentrate and build way up as you no longer have to build parking space into apartments. A more densely populated city with fewer dedicated drivers might have more political reasons to become bike-friendly.
I now understand it can handle the terrain, thanks for the explanation that is pretty neat they could do it thirty years ago, just curious when I tell it to go to a house in the middle of a 20 acre property with multiple private roads, and I use the term road lightly, if it is actively going to search for a path or if it will have to have manual intervention.
I have seen google cars handle well mapped streets, just curious.