Sure, and the lockscreen is another place to put information like this.
> It's just a swipe down or a swipe up.
That's why I prefer a widget (or lockscreen), there's no swiping required at all. As for getting push notifications for the subway... No thanks, I don't want a notification every time some subway line is running a little slow. I only want notifications for events I care about, with few or no false-positives.