I completely forgot, the other day I was crossing the Ben Franklin bridge into NJ and I saw a zipper doing its thing.

For those of you that don't know: The zipper is a slow moving vehicle that guides barriers though the under side of the machine in which case it snakes the barriers over giving traffic another lane in one direction, taking one from the other.

Not really sure if this is that cool, but never did I think I'd ever see one.