That wouldn't work very well in most of San Francisco - there are driveways/curb cuts all over the place. That's fine if the cars are next to the curb, but if t

That wouldn't work very well in most of San Francisco - there are driveways/curb cuts all over the place. That's fine if the cars are next to the curb, but if they are on the other side of the bike lane, it's pretty tough to get in and out of driveways (and screws up the bike lane).