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I think it's at least partially real--in Arizona, they have these things that they deploy whenever there's an accident or stalled car. They're like giant unfoldable walls that are about 15 feet high, and they just stand them up around the entire accident so there's absolutely no way you can see what's going on. Traffic just zips right by.
Edit: I say Arizona, but actually, the only place I saw them was in Phoenix when I was visiting. Could just be a local thing.
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