That's one thing that still puzzles me when I see someone walking in the street about 5 feet away from a smooth empty sidewalk. I don't think it's cultural as I've seen people of different races/genders/cultures/ages doing this at different times of the day. And yes I know some joggers feel that the road is easier on their knees and won't use the sidewalk - that's not what I'm wondering about here. A quick internet search showed I'm not the only one with this question but didn't have any answers, is there a better one than people do stupid things on a regular basis?