I used to wonder, years ago when I lived in SF, why does a supposedly green city have such lousy public transportation? If this is successful, expect MUNI to use legal means to get rid of it.
[1] http://missionlocal.org/2014/06/up-until-the-1970s-muni-had-...
http://www.sfgate.com/news/article/A-One-Man-Traffic-Buster-...
In Paris, using your car is hell but you have a good transportation network.
In smaller French cities, the transportation network is less developed but you can take your car everywhere and park easily.
But San Francisco... Both parking and mass transit is bad! The only viable solution is the bike, but that only works if you're living in the city.