Many places don't have much mass transit, but even the ones that do often focus on commuters. That's not nuts, of course, but the focus also tends to be on car-substitution, where transit's value is essentially measured by how many cars it pulls off congested highways at peak time.
The rise in off peak travel suggests that (in some places) more people are using transit to get around generally. It isn't just "well, I could drive to work or I could drive to the park-n-ride lot and commute in by train."
Yes, yes, again, many places don't have mass transit options. I know this!