On days that I drive to work I walk approximately 2 km from the parking lot to my office. I work in a large complex and have occasionally walked as much as 6 km between buildings on a single day. When I ride my bike I only have to walk about 1.5 km to my office, but sometimes still have to do the long walks around site.
I think a lot of folks around here take up walking for exercise when winter comes, but just as many get out their XC skis, and a much smaller group get their studded bike tires on.