access barrier barring bollards denying denying access in the way metal metal bollards barring access no thoroughfare prevention protection reflections reflective shiny silvery advice advising alert automobiles black cars closed communicate communication dead-end end information informing lettering letters limited limited-access message motor-vehicles no-thoroughfare no-through-road restricted restriction restrictions road roadway safety sign vehicles warning white wording words chips concrete concrete bollards council garden edge edge of council public roadside garden pillars plants public roadside garden pyramid shaped pyramid topped roadside roadside garden shaped shapes wood wood chips access-denied apology appropriate-behavior appropriate-behaviour avoid behavior behaviour beware care caution concern construction construction-site danger dangerous entry-denied entry-prohibited inconvenience inconvenient no-access no-entry not-allowed not-permitted permission-denied prohibited prohibition risk risks risky warning-sign yellow