Turn signals are one of the earliest automotive safety features. In the early 1900s, some cars came with mechanical arm "trafficators" that would pop out of either side of the car to indicate a turn.

HONOLULU (KHON2) — In the world of Hawaiʻi’s motorcycles, bicycles, motorbikes, and skateboards, there’s an important rule everyone should remember: Safety comes first. Riders share the road with cars ...