It's greatly inflated by virtue of doing it by county instead, mingling major transit routes with fully rural areas.

But even that aside I strongly agree. Cook county would be under 50 if people were more willing to take the train

Availability isn't the question. I'm assuming the survey question is "do you drive to work or take public transportation."

I have the ability to take a train to work, but it would take me an extra 30 minutes or so each way because I live only a minute walk from the train station, but my job is about a mile away. Also, the train costs me more than driving. I've done it, and would rather do it, but it doesn't work well enough.