black care caution communicating communication crossing informing pedestrians reflective sign speed reduction street sign traffic traffic flow warning yellow circular directing direction directional indication indicator roundabout arrows curved give-way red triangle triangular white advice alert announcement appropriate-behavior appropriate-behaviour be-careful beware careful cars cautious concern conditions danger dangerous directions gravel Look looking lookout observant risk risks road-conditions safety signs slippage slow slow-down speed speed-reduction vehicles warning-sign watch watch-out slippery wet road-risks rural tractor tractors directive font footpath information message roads roadside signage slower street street-sign temporary traffic-flow uneven-surfaces walkers walking wording words large-vehicles look-out road-train rural-area semi-trailers symbol text trailers transport transportation trucking trucks risky road road-sign stop walk aged aging elderly old security seniors share sharing