三开门及其他：另类车型大赏

土星离子：2003—2007年

    土星离子（Saturn Ion）是土星品牌的另一个创新失败之作。除了沉重昂贵的塑料车身之外，它的失败之处还在于它的“对开门”式设计。后方车门很窄，看起来就像衣柜的门，只有正常车门宽度的一半，而且不能单独打开，只有在前门打开之后才能开启。离子轿车2007年就淡出了市场，两年后，整个土星产品线也随之湮灭。此后，通用（General Motors）和其他美国厂商再也没搞过“对开门”的轿车设计。

Saturn Ion: 2003-2007

    Along with heavy, expensive plastic skin, the Ion "quad coupe" with two small hatch-like rear doors represents another failed innovation by Saturn. The rear half-size apertures couldn't be operated independently; they could only be opened after the front doors. The Ion disappeared in 2007, and the entire Saturn line followed it into oblivion two years later. Not General Motors nor any other American manufacturer has seen fit to revive the quad coupe since then.