My son who lives in Pittsburgh says there is a large army of people who are responsible for moving cones around the city of Pittsburgh which always has construction and closed lanes occurring all year long. He said that these workers put up all the cones and then they move them around and then they put them back where they started from. Thus the cones are constantly being moved around and sometimes they actually do have construction being done, but this is not necessarily the case. Maybe they do that here?
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