In the audio titled "Expressway", the main theme revolves around the bustling life of a highway. It starts with the distant hum of cars passing by, gradually transitioning into the heart of the highway soundscape. The cacophony of engines, the swoosh of fast-moving vehicles, and the occasional honking paint a vivid picture of a busy expressway. The audio texture is rich, with the unique sounds of various vehicles, creating a realistic ambiance of a street teeming with traffic. The alternating rhythm of speeding cars and slower moving traffic creates an auditory landscape that mirrors the ebb and flow of life on a bustling expressway.