Ключевые слова: 911, aid, alarm, art, auto, background, big, burning, car, cartoon, city, color, colorful, contour, danger, department, design, emergency, engine, equipment, fire, firefighter, fireman, firetruck, help, hero, hose, icon, illustration, isolated, ladder, line, linear, lineart, outline, rescue, safety, save, security, service, siren, transport, transportation, truck, unit, vehicle, water,