It’s old, it’s sinking, and it’s structurally unsound -especially if a big earthquake were to hit. That’s why the board of supervisors unanimously placed Proposition A on the San Francisco ballot. If it passed, it would kickstart repairs. Most local leaders support Prop A, but opponents argue that like many big city infrastructure projects, it may go over time and over budget. KALW’s Angela Johnston tells us more about the first proposition you’ll see on your San Francisco ballot.