Who invented car turn signals?

The invention of the car turn signal dates back to 1914, with the early concept proposed by Hollywood star Florence Lawrence. She designed a mechanical device called the "auto-signal arm," which controlled the raising and lowering of a flag on the rear bumper via a button to indicate the direction of the turn, addressing the safety hazard at the time where drivers had to signal with their hands. In 1936, Buick became the first to mass-produce cars equipped with an electronic turn signal system, using a technology that combined relays and lights to achieve flashing turn indications. The turn signal technology has evolved from mechanical to electronic, and now integrates LED technology, featuring high brightness and low energy consumption, becoming a core part of vehicle safety configurations.