From the driver's perspective, there is no Doppler shift . The driver moves with the sound source, hearing a constant, deafening mechanical drone rather than the "passing" effect. A Matter of Life and Death - NASA
The sound bounces off the concrete, creating a "wall of noise" that vibrates in the chest. race_car_passing_sound_effect
As a race car approaches, it is moving at high speeds toward the listener. Because the car is "chasing" the sound waves it emits, the waves are compressed together. From the driver's perspective, there is no Doppler shift
As the car moves away, it "stretches" the sound waves behind it. The frequency drops, resulting in the characteristic lower-pitched growl . 2. The Anatomy of the Sound As a race car approaches, it is moving
The resonant frequency of the exhaust pipe, often tuned by engineers to sound aggressive or "musical."
The compressed waves reach your ear at a higher frequency, resulting in a higher pitch .