WTF? Close one escalator at a time, and run the other two in opposing directions. Or close two at a time and run the remaining one in peak direction (down in the morning, up in the afternoon). If the process is gonna take a year even with all three closed, then there's no real advantage to doing a full closure.
Refresh my memory: does the south entrance to Dupont have a glass canopy yet?
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la forme d'une ville change plus vite, hélas! que le coeur d'un mortel...
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