Oh, so you mean bi-directional winds are winds that blow back and forth in the same direction, changing only infrequently?
“changing only infrequently?”
No, that is not how winds work, especially when the wind force is light and variable. Look at how trade winds have a predominate direction during a season when the wind force is substantial. When these stronger force winds occur within a boundary area between two major air masses such as the Hadley cell and the Mid-Latitude cell, the wind forces tend to cancel each other out except along the plane of contact, leaving a predominate wind flow in one direction or the opposite direction along the axis parallel to the boundary between the two major air masses.