It is to show courtesy. Yes, they do think they will get to the other side faster. Maybe because you see it in older people, that is as fast as they go. They are just trying to be nice and show thanks.
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Name : Brittany23066, Gender : F, Sexual Orientation : Straight, Race : White/Caucasian, Age : 20, City : Fairfax, State : NY, Country : United States, Social class : Middle class,