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Awd Systems Market Share, Trends by 2031 - TMR In an AWD system, the power is transmitted to all the wheels of the vehicle to improve traction and control of the vehicle. The system engages a secondary axle before the slippage occurs, and also distributes the torque equally between the axles when the vehicle is turning. Alternatively, in a 4WD system, the driver can decide the wheels to which the torque has to be transmitted.