The Polaris Slingshot is a cross between a motorcycle and a road-legal go-kart. It's closest to a track-ready, three-wheeled tricycle, offering plenty of power, nifty handling, and a car-like driving ...

Motorized, three-wheel conveyances have been around at least since 1886 when the Benz Patent Motorwagen debuted as the first "automobile." Historically, they usually have one wheel in front and two in ...