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I must plead complete ignorance to what goes on in the yards but, I wanted to add my two pennies to the discussion. <br />From my perspective, I would think that the windsocks would be used for HAZMAT conditions. My reasoning is thus.. The folks in the yard can probably "feel" the wind and judge it's effects without use of a sock. The people inside the offices would need the socks because they can't "feel" the wind and will need to notify emergency personnel which direction the hazard may be blowing. <br /> <br />Paul
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