I imagine that this is probably common knowledge among Chicago buffs - but... What is the deal with the green light on the officer side of the apparatus? I was told that it had something to do with maritime rules of port and starboard (?) In my state, a green light indicates a command post. <img src='http://www.firepics.net/groupboards/public/style_emoticons/<#EMO_DIR#>/shrug.gif' class='bbc_emoticon' alt='
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