Walkers know they can be in other places in their minds while they move. They also know that others they encounter may or may not respond to their greetings.
Last September Mary Jo DiLonardo posted about the topic; she referenced unpublished and published studies. With more people walking more the post is timely.
Hello, stranger.— Treehugger.com (@Treehugger) June 30, 2020
(Please don't make this silence awkward)https://t.co/xB9fRrJh21 pic.twitter.com/LcnPA55NTG