access-denied advice advising alert automobiles behave black communicate communication denied directive entry-denied entry-prohibited information informing no-access no-entry not-allowed not-permitted permission-denied prohibited prohibition red restricted restriction restrictions safety sign vehicles warning white appropriate-behavior appropriate-behaviour behavior behaviour direction keep-out unauthorised unauthorized chain chained chained-off access-limited directions keep-off barrier caution cautious blue limited-access prosecution trespass trespassing brown damaged rough scratches scrathed authorised-approval authorized-approval exception limitations limited staff staff-approval staff-approved