Because all-wheel drive and four-wheel drive send power to all four wheels, rather than two, they do provide roughly twice as much traction as a two-wheel-drive vehicle for accelerating in slippery conditions. But these systems help only with accelerating the vehicle on snow-covered or icy roads.Generally, 4WD and AWD are only necessary if you live in a climate where it snows and rains a lot. If you drive on dirt roads that are frequently muddy, they can provide more confidence when it matters most. ... In fact, 4WD and AWD can only take you so far if you don't have the right tires equipped..