Ключевые слова: ahead, america, american, area, asphalt, attention, barrels, barrier, canada, canadian, caution, closed, condition, construction, country, danger, ends, hazard, highway, information, north, orange, paved, post, right, road, roadside, roadsign, route, rural, safety, sign, signage, signal, signpost, site, states, surface, symbol, symbols, temporary, traffic, transport, transportation, under, warning, way, work, zone,