In a mobility management aspect of the invention, several unique mobility management control messages are defined for use in performing various mobility management functions in the communications system with respect to the mobile user stations and network nodes. A straight line passing through a ball joint and a rubber bushing joint intersects the road surface at an intersection point that is positioned behind a ground contact point of the rear wheel in the longitudinal direction of the vehicle body. A diffusing pattern is formed on one of the upper surface and the lower surface. In preferred embodiments the transducer element and amplifier are silicon-based. It also relates to recombinant vectors, containing such DNA fragment, which enable this protective gene to be introduced and expressed into cells and plant cells. Corrective action may be performed upon sub-systems by the SHM depending on their health status or the health status of the server.