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What do the red and blue lights on the I-355 south extention over the Des Plaines valley bridge mean?

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What do the red and blue lights on the I-355 south extention over the Des Plaines valley bridge mean?

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  1. i dont really remeber seeing them there but i dont drive there alot i stick to I-88

    but i think that it might be a signal to airplanes that there is a road there or something


  2. It means you need to pull over and find out what the cop wants.
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