Ключевые слова: against green, america, arm, attention, barrier, beacon, blinking, blue, ca, cable, california, caution, copy space, cross, crossing, danger, electric, electricity, electrified, flash, flashing, freight, icon, indicator, industrial, industry, infrastructure, journey, light, metal, movement, moving, nature, notification, passing, pole, post, rail, railroad, railroad crossing, railway, raised, red, road, safety, security, sign, signage, signal, signs, sky, stop, symbol, track, traffic, train, transport, transportation, travel, trees, trip, us, warning, way, white, wire,