What do the Elio, Aptera,{}Toyota i-Road concept{}and the spectacularly awful Zap Xebra have in common? They--and many more small-volume economical vehicles and concepts besides--all use one fewer ...

Three-wheeled cars have long stood on weird legal ground between real cars and motorcycles. They’re not car-cars (for lack of a better term), so they don’t have to be subjected to crash testing, and ...