advice aged aging alert announcement be-careful beware black care careful caution communicating communication concern crossing danger dangerous elderly information informing lookout observant old pedestrians risk risks risky road-sign safety security seniors sign signage signs slow speed-reduction street-sign symbol traffic traffic-flow walk walkers walking warning warning-sign watch watch-out yellow cutter cutting equipment fuel grass grass-cutter groundsman lawn lawn-care lawn-mower machine machinery man mower petrol-mower power rotary-mower rotation rough rustic trimmer trimming work workman appropriate-behavior appropriate-behaviour directions font Look looking parallel-signage rectangle red reflective slow-down speed speed-hump steel-post traffic-sign triangle white word road share sharing stop animal appropriate behavior appropriate behaviour blue control dog dogs lead leash restrain restrained restricted restriction rules cars cautious conditions road-conditions road-risks rural slippage slippery tractor tractors vehicles animals awareness be careful birds bright chickens chicks crossing- alert ducklings ducks protection road crossing watchout water birds water fowl wildlife behavior behaviour communicate local public-area reptiles restrictions seen sighting sightings snakes venomous pet pets double-lines island refuge small-traffic-island traffic-island large-vehicles look-out road-train rural-area semi-trailers text trailers transport transportation trucking trucks words