A not-insignificant part of driving a vehicle of any kind, no matter how many wheels it has, is knowing the necessary methods for signaling intent — lane changes, warnings to other drivers, that sort ...

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.

"Londoners drive abreast, packed nose to tail and side to side, and they have gradually evolved a complicated code of their own, as different from the Highway Code as contract bridge conventions are ...