Turn signal sounds come from the indicator relay inside a car, which produces a regular clicking noise each time the lights flash. That familiar rhythm has become a universal audio cue for driving, direction changes, and waiting in traffic. Online, creators use recordings like this in videos, games, animations, and memes to instantly place the audience inside a vehicle without showing one. Its popularity comes from how recognisable it is, even to people who do not drive, making it a simple shorthand for patience, indecision, or an upcoming turn.