alert announcement be-careful beware black blocked blocked-path care careful caution communicating communication danger detour directing direction go-around informing lookout observant observe pedestrians safety security sign warning watch watch-out yellow alternative-way arrow discoloration message wording words access-denied barricade barrier beach beach-path beach-sands blockade closure dry dry-sand dune-vegetation emergency-mesh erected erosion erosion-control fenced footprints greenery light netting obstacle outdoors outside perspectives plants public quiet red sand sand-tracks sandy seashore seaside secured shadows shore slope sloping summer sun sunlight sunshine tracks uneven warm