[RRL]

Look at it this way,

There is at least one lane on either side of the road at full capacity. Always bumper to bumper. But, the cars do not move save 2% of the time when their operators remove them from the traffic jam, I mean parking spot. There are 275,450 streetside parking spots in San Francisco city limits. Assuming a pooling of some drivers, and an increased utility of roads due to size & traffic flow then we can look forward to a net decrease of cars on roads and a net increase of available land for expanded sidewalks and bike paths.