Direction of drift velocity in the Hall effect equation

[Vishera]

So my textbook is explaining the hall effect and the following equation was derived:

∆V_H=v_d·B·W

But if you look at the diagram, it appears that v_d is pointing both ways. So which direction is v_d pointing in? Or is this because electrons in the opposite direction is the same thing as holes in the correct direction as per traditional current?

 

[nasu]

Yes, the electrons and holes move in opposite directions.