Although I have never lived in San Francisco, I am a Philadelphian and think I can say with confidence that Philly is just as rough or (likely, I think) more ch

Although I have never lived in San Francisco, I am a Philadelphian and think I can say with confidence that Philly is just as rough or (likely, I think) more challenging of an urban environment to deploy something like this. Philly can be a pretty rough city.