access-denied advice advising alert apology appropriate-behavior appropriate-behaviour avoid behavior behaviour beware black care caution communicate communication concern construction construction-site danger dangerous entry-denied entry-prohibited inconvenience inconvenient information informing no-access no-entry not-allowed not-permitted permission-denied prohibited prohibition restricted restriction restrictions risk risks risky safety sign warning warning-sign yellow active activities broken communicating equipment limitations limited limits message not-working out-of-order sorry to-be-fixed unfortunate unusable unworkable useless wording