The wail is one of the standard tones programmed into modern emergency vehicle sirens, including models made by companies such as Whelen, and it has been heard on police cars, fire trucks and ambulances for decades. Because the slow rise and fall carries well over distance and is instantly understood as an emergency warning, it became a staple stock effect for films, television and later online video. Creators now reuse it in edits, gaming clips and prank videos whenever they need an immediate signal that help, trouble or the police are coming, without showing a real vehicle at all.