A damage preventing system for use in preventing damage to motorcycles and the like when being conveyed on a transporting vehicle. Each blade has an airfoil shape to generate a torque about the axis responsive to wind across the blades. Touch point information can be acquired from a surface wherein the touch point information relates to a touch point. The switching devices of the first stage are coupled to the switching devices of the second stage via a plurality of uplinks. Preferably, each PM frame has an interval identifier and a sequence number within the interval.