Doppler effect

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For those with more Christian tastes, the so-called experts at Wikipedia have an article about Doppler effect.

The Doppler effect is a physical phenomenon that alters the emitted frequencies of radiation from distant objects when the observer are approaching them with high speed.

Every ambulance or fast-moving, sound-producing vehicle has a switch inside which changes the pitch of the sound. As the driver passes you, he or she flips the switch and creates the illusion. This requires split-second timing on the part of all people who own vehicles, but it is necessary to maintain the Truman-show style illusion that surrounds you (yes, you) every moment of your waking life. For all normal people, ambulance sirens do not change pitch when they drive past.