Michael From American crime series, you surely know that American police cars don't go "nee-naw" but "wee-woo-wee-wooo." There is also a difference between police sirens and those of fire trucks or ambulances. Ambulances tend to make a long "weeeeeee," while fire trucks, at least in San Francisco, make a "weeeeeee-wahhhhhh," with the "wahhh" being produced by a horn-like instrument that creates such a low-frequency infernal noise that you voluntarily pull over.
As a visual aid, an MP3 file is attached to this newsletter. Our neighbor's dog has the silly habit of howling at the fire trucks that frequently race around our neighborhood, as the fire station is just a few blocks away. I taped the Howling of the neighbor's dog with my voice recorder. Judge for yourselves how stupid a) the dog and b) the neighbor is!