Rain. Wind. Snow. Freezing temperatures. Hot & humid temperatures. Bad neighborhoods. Heavy briefcase.

All sorts of reasons.

Several years ago in Houston, we (there were several of us) drove across the street to have lunch most days. Over the course of a year, I never walked the route. Line of sight was maybe 500 yards, but a busy freeway was between the restaurant and our office. While you might think I'm crazy, I don't recall ever seeing any other business-dressed people walk under that freeway. you would be soaking wet from the heat & humidity by the time you got to lunch.