When these two components connected, a current would pass through them and power the electric turn signal lights. Drivers would switch on their blinker, and the electricity would heat up a bimetallic spring in the car, causing it to bend until it made contact with a small strip of metal. Traditionally, the clicking sound is made via heat. The flashing turn signals began appearing in automobiles in the late 1930s when Buick made them standard in some models. According to Jalopnik, there's one thing that has changed, though: the actual source of that familiar sound. Even as technology has progressed, this feature has remained a constant throughout generations of vehicles-or at least that's how it appears to drivers. Along with the flashing bulb behind the arrow in your car's dashboard, the gentle, rhythmic tick tick tick-ing tones are a sign that your blinker is working properly when you switch it on. The clicking of a turn signal ranks among the least-annoying sounds a car can make.
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