aid blind pedestrian blindness disabled folding handicapped help mobility stick visually impaired access-denied access-limited advice alert appropriate-behavior appropriate-behaviour behave behavior behaviour black blue communicate communication denied directions don’t limited-access no no-access no-entry no-pedestrians not-allowed not-permitted pedestrian permission-denied prohibited prohibition red restricted restriction restrictions sign unauthorised unauthorized warning asphalt bend curve curved distance forward future grass path tarmac walk walking Alley building Cordoba passage pavement Spain spanish street town urban castle keep loom looming Norman Norwich pedestrians shadows shop shoppers steps tower care caution communicating crossing informing reflective speed reduction street sign traffic traffic flow yellow 777575 777577 777578 794372 803229 bridge downtown elevated minneapolis minnesota mn pedway skywalk skyway walkway