To be clear, in all the projects that I've seen by the SFMTrA, the crosswalks or bikelanes already existed—both physically and legally—but their usability was/is extremely compromised due to fundamentally lacking infrastructure and very minimal enforcement of moving violations in San Francisco.

Like Tullius mentions, these are improvements that should have been installed by the government (and may be eventually), but which aren't due to incredibly untimely bureaucratic processes.