Standing on the Corner Watching All the Cars Go By

A while ago as I drove by a particular intersection, a man stood on the corner, greeting all cars as they passed by with a wave and a friendly "Hello there." As time went by, I noticed he was there at his post most days greeting everyone as they arrived. I started waving and greeting him as I drove by. I don't know what made him decide to do this. Is he just friendly, lonely or trying to have a little impact on human relationships? Whatever the reason, I have enjoyed seeing him every day. I look forward to it and find it brightens my day just a little.