The sounds that are produced by these vehicles in the movie are examples of invisible sounds.
A sound can be defined as a disturbance (vibration) in a transmission medium that progressively transports energy from a source location to another location without the transportation of matter. Also, a sound is generally heard when it reaches a living organism's ear such as a human being.
In Arts, there are two (2) main types of sound and these include:
An invisible sound is also referred to as a non-diegetic or acousmatic sound and it can be defined as a type of sound whose source is not revealed or visible on the screen to the viewers (audience) of a movie such as vehicles honking in a particular frame of a movie scene.
In conclusion, the sounds that are produced by these vehicles in the movie are examples of invisible sounds.
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