"Mayor Breed has directed City departments to model safe habits on our street and has established guidelines that, unless responding to an emergency, City vehicles should never block the pedestrian right-of-way or bicycle lanes." [emphasis added]
That's not ambiguous. It also reaffirms existing law: it's illegal (with a few exceptions) and dangerous to block a bike lane.
And then this happened Wednesday evening:
Thank you, Kyle Grochmal, for your tireless activism. But no thank you, SFMTA, for this response: