Incorrect Information on Google Maps : Why Does Google Maps Display a Highway Lock that Does Not Exist?

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Google Maps usually knows exactly where traffic jams are on the route and how long it is expected to take us to reach our destination. But sometimes it also shows a false highway lock like on the A9 between the exits Berg/Bad Steben and Rudolphstein in the direction of Berlin. Why?

frankenpost.de

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On the A9 near Berg there is a full lock. That says at least Google Maps. As it turns out, that's not true at all. What's behind it?