I think there's a tipping point where this is no longer the case. I live in Seattle, a great city for bus rides, and at least at rush hour, it's 95% office comm

I think there's a tipping point where this is no longer the case. I live in Seattle, a great city for bus rides, and at least at rush hour, it's 95% office commuters going to/from work. No problems if you travel at rush hour.