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Presumably, fewer cars means less road repair necessary.

I'd assume it was miles, not cars, that would govern. 1 car driven 20 miles causes as much wear as 2 cars driven 10 miles each.

Driverless cars may increase total miles driven, by making driving more convenient and shared cars (which many driverless cars would become) increase miles by adding "deadhead" miles to reposition between dropoff X-1 and pickup X.

But you can have streets which are far narrower as driverless cars can coordinate on how to make it work well.

Ya, but they don't need a lane everywhere to park if there's 80% fewer of them