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Concept cars have always been a place for automakers to make outrageous promises. Wild horsepower figures, futuristic technology and projected top speeds look great on a spec sheet—but actually putting a prototype on a track and proving what it can do is another matter entirely. That distinction is important for this list. Take the 1995 Ford GT90. Its quad-turbo V12 and futuristic body came with a widely publicized claimed top speed of 253 mph, yet the prototype never underwe

Yamaha is one of the biggest names in motorcycles, but its history with four wheels runs much deeper than most people realize. Long before the company showed futuristic concepts at the Tokyo Motor Show, Yamaha had already designed its own sports cars, engineered engines for other automakers and experimented with everything from lightweight city cars to a Formula 1-powered supercar. Some were created entirely in-house, others were developed with major Japanese automakers, and

There was a time when a concept truck did not need to look 90 percent ready for production. Automakers used pickups as rolling experiments, testing everything from Viper-powered roadsters and mid-engine car-truck hybrids to hydrogen-burning V10s, washable cargo areas, four-wheel steering, built-in generators, and cabins that doubled as mobile offices. Some of these trucks introduced genuinely useful ideas. Others existed mainly to stop people in their tracks at an auto show.