Winds are deflected more at the poles than the equator. It is due to the effect of Coriolis force. Coriolis force is produced by the rotation of the earth. The Coriolis force is zero at the equator and maximum at the poles. At the poles, the plane of deflection force is parallel to the earth's surface and is reduced to zero at the equator where there are no components of deflection in a plane parallel to the earth surface.