All-wheel-drive was viewed as nothing less than a metaphysical advance when Audi AG introduced its quattro technology for road cars in 1980. In the quarter century since, adaptation for all types of vehicles has fostered countless engineering variations, but the goal essentially is the same: distribute power to all four wheels to augment traction and security. AWD provides undeniable worth in foul-weather conditions (and off-road, of course), and is a key attribute in the meteoric growth ...

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