Why does your car's turn signal make that rhythmic clicking sound?
In short: This video explores the origins of the modern turn signal and the mechanical history behind the familiar clicking sound that alerts drivers to their active indicators.
The modern directional signal traces its roots to a 1925 patent by Edgar A. Walz, Jr. Despite his invention, the technology saw little interest until his patent expired 14 years later. In 1939, Buick introduced the Flash-Way Directional Signal, which featured a steering column-mounted stick.
Initially, this system only activated the rear lights, but by 1940, the design was updated to include front lights as well. Following the conclusion of World War II, directional signals became a standard feature in the majority of American automobiles.
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- Summary by Intellect · source: What Causes the Clicking Sound Your Turn Signal Makes?
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