Yamaha's Electric Power Steering, an industry first, makes riding more comfortable. This is especially convenient when riding over rough terrain or riding with the racks loaded, when steering can take more energy. The system is driven by a dedicated ECU that measures steering input force versus tire resistance and vehicle speed, then provides appropriate assist to the steering column through an electric motor. This system helps lighten steering for more comfort on rough terrain. The process takes only milliseconds to calculate and engage, so the rider never even knows that the EPS is activated, except for the comfort in controlling the machine. It also greatly reduces the torque needed to steer the ATV when in 4-wheel full diff-lock.