The linked page describes exactly that - "Left Turn Calming" projects. > At SFMTA, we’re working hard to help drivers make left turns the right way. We’ve inst

The linked page describes exactly that - "Left Turn Calming" projects. > At SFMTA, we’re working hard to help drivers make left turns the right way. We’ve installed Left Turn Guide Bumps at designated intersections around the City, with painted safety zones and raised bumps to remind drivers to slow down and make squarer left turns. We’ll test how well these treatments make left turns safer, with a long-term goal of installing calming project at other intersections where they are needed most.