>> I walk 4km to work when its nice out here in Europe. Could I do that in the USA?

I had a business trip to Germany (from the US) and found it enlightening. We all went out to eat after work one night and a couple of the local Germans had to walk 20 minutes from the restaurant to the train station to go home and didn't think anything of it. It wasn't a big deal to walk, but you'd never do that here in the US - or at least in Michigan where we have no real public transportation.