Ключевые слова: autobahn, background, barrier, behind, blue, car, city, concrete, construction, control, curve, decibels, environment, europe, expressway, freeway, grass, green, health, highway, hum, lane, life, loudness, measurement, modern, multiple, nature, noise, proof, protect, protecting, protection, protective, road, safety, screen, sky, sound, soundproof, soundwall, speedway, street, technology, traffic, transport, transportation, urban, wall, way,