Do you greet them only on Shabbos, or on any day of the week?
When walking, usually only on Shabbos, as I take a more leisurely walk then. Other times, either I or the other people tend to be rushing here or there and the opportunity does not really exist. However, when it does, I do. For example, I always wish the bus driver a “good morning/evening” when I get on the bus.
The Wolf