The correct answer to this open question is the following.
When someone is walking on the right side of the sidewalk, and you are walking faster and overtake them to their left, this is a folkway in the United States.
In simple terms, a folkway is a norm that stems from tradition and good manners and serves to organize casual interactions on a daily basis. Some scientists call it social norms. The first author that used the term folkway was the sociologist William Graham Summer in his book of 1906 called "Folkways: A Study of the Sociological Importance of Usages, Manner, Customs, Mores, and Morals."
