Lake Superior Maritime Visitor Center Cam #2 (Live)
You are viewing the Duluth Aerial Lift Bridge which is a major landmark in the Midwest. The bridge goes up 25 to 30 times daily during busy parts of the shipping season.  As ships pass, there is a customary horn-blowing sequence that is copied back. Long-short-long-short means to raise the bridge, and long-short-short is a friendly salute.
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