What car has the first turn signal?

The first car equipped with turn signals was a model introduced by Buick in 1936. Prior to this, drivers relied on hand signals or mechanical pop-out indicators invented by Hollywood actress Florence Lawrence in 1914. The yellow colour of turn signals was chosen primarily for its superior visibility in rainy and foggy conditions. Modern turn signal systems retain the characteristic "clicking" sound tradition from mechanical relays, though now simulated by electronic buzzers. Notably, in 1938 Buick offered rear-mounted turn signals only as optional equipment, with the front-and-rear dual signal configuration not becoming standard until after 1940. This progression demonstrates the incremental advancement of automotive safety design.