[jakeogh]

You are making too many assumptions. It's easy to design city centers so it's not worth the trouble for most people to drive through them. Downtown my city is like that. We drive around it. I have seen the opposite, your worst case, but that's their fault. And ya, distance matters. I live only ~6 miles from where I work, and I rode a bike for a year, but I can drive it in a fraction of the time and then not worry about changing plans or going somewhere much further away without first pedaling myself home.