Can you gather some information that backs up your claims here? How would devoting an extra lane to cars increase efficiency? I can't see a scenario where this would do anything but the opposite effect.
In case it's not clear, I'm refering to California st starting downtown and going all the way up the hill.
Car lanes in the city consume a significant public resource (space) and encourage negative externalities (noise, heat, air pollution, etc.). They should absolutely be replaced with more space efficient options: tram tracks & bike lanes.