"Il est interdit de parler dans les escaliers."
Translation:It is forbidden to talk on the stairs.
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Unless "in the stairs" is what you usually say when you're using the stairs in the usual manner (i.e. not having somehow partially fallen through them and now being stuck in them) I would stick to "on the stairs".
Things don't have a one-to-one translation. "Sur" does not always mean "on".