DETROIT — Google’s driverless car may still be a work in progress, but the potential for semiautonomous vehicles on American roads is no longer the stuff of science fiction.

By the end of the decade, a growing number of automakers aim to offer some form of hands-off-the-wheel, feet-off-the-pedals highway driving where a driver can sit back and let the car take control.

The very nature of driving, experts say, will be radically reshaped — and the biggest players in the auto industry are now vying to capture a slice of the revolutionary market they see coming within a matter of years.

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