Ключевые слова: alert, art, attention, background, barrier, blue, border, boundary, build, caution, cone, construct, construction, contour, danger, design, equipment, forbidden, highway, icon, illustration, industry, isolated, line, linear, lineart, marking, object, obstacle, outline, plastic, reflection, repair, road, safety, security, sign, signal, site, stop, street, striped, symbol, traffic, transportation, under, warning, white, work,