Ключевые слова: ahead, america, american, attention, background, canada, canadian, car, caution, cliff, collision, country, crag, danger, edge, fallen, federal, highway, information, law, mutcd, north, notice, ontario, post, prepared, risk, road, roadside, roadsign, rock, rocky, route, rural, side, sign, signage, signpost, slope, states, stones, symbol, tac, traffic, transport, transportation, warning, watch, way, yellow,