Girls that keep their head down when walking past a guy?

Anonymous
I see girls do this all the time. I'll be walking and some girl will be walking in the opposite direction and she will look down until she passes me. As soon as she passes me she'll put her head back up again. So my questions are:

Do they do this because they're shy or just not interested and don't want to give the wrong impression? Do you do this with every guy/girl or just guys that you might find attractive?
Girls that keep their head down when walking past a guy?
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