joining us live now is the standard senior reporter, josh cahn, who wrote that article. hey, josh. >> hey, kristen. how are you? good, good. >> i mean, we work in san francisco, so we know. but for those who don't. how important is market street and what has been its role in the city? yeah market street is basically the most important traffic artery of all of san francisco. >> the street's history dates back to 1847, so it's a legitimately as old as the city itself. and really, when you come to san francisco, you're going to almost always have to navigate market street because it's got the bart lines, it's got bus lanes, it's got muni metro subway underneath bike lanes, pedestrians and until just a few years ago, rs. >> that's right. these are old pictures, of course. and it's kind of the demarcation line between north and south san francisco. right? so that's right. it's in the heart of the city. but four years ago, like you mentioned, t city banned private vehicles from the eastern part of market street to private vehicles. w? what was that rationale? yeah >> so the ban