For years, Google’s Waymo driverless taxis have been wreaking havoc on San Francisco streets — and an increasing number of other cities as the service expands — triggering traffic jams, getting stuck ...

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.

Add Yahoo as a preferred source to see more of our stories on Google. Turn signals are one of the earliest automotive safety features. In the early 1900s, some cars came with mechanical arm ...