Some might say it's downright un-American, the idea of regularly sharing a car that's not your own, with someone who's not your immediate family. Others might say it's just not Detroit, where car ownership has so long been a rite of passage.

Yet through a combination of technology and business savvy, the world's most successful car share program, Zipcar, has found a strong market in Detroit. The company was founded near Boston, America's cradle of independence, and now boasts membership heading towards one million, and a fleet of over 9,000 vehicles in the U.S., Canada and the U.K.

Read the whole story at Model D