Beeping with men speaking faintly in the distance with an air release
A truck engine running as a man yells in the distance followed by steam hissing as vehicles drive by in the background
Truck engines are running, a shrill back-up alarm rings, air brakes engage, and adult males are talking in the background
Whistling and humming with men speaking in the distance
A truck engine running while warning beeps sound followed by a man yelling then compressed air releasing