Ключевые слова: 20, area, asphalt, auto, background, black, careful, carefully, circle, concept, conceptual, concrete, danger, drive, horizontal, icon, illustration, image, kilometers, lane, limit, line, measure, measurement, miles, number, painted, plot, red, restricted, restriction, road, safety, sign, signal, space, speed, street, symbol, topics, town, traffic, transport, transportation, twenty, unit, vehicles, warning, way, white,