Picture this: you’re cruising down the road, the sun’s shining, and you’re feeling pretty good about life. Suddenly, there’s a police officer waving his hands like he’s orchestrating a symphony, ...

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.

As more Americans turn to biking for commuting, exercise and recreation, the roads are growing more crowded and more dangerous as cyclist fatalities have risen sharply nationwide. While crashes are ...