A pressure sensing cable in one embodiment includes an optical fiber having a first core and a second core. Each of the display panels is mounted proximate a roadway or other public venue and is optically visible to persons traveling along the roadway or otherwise in the public venue. The front surfaces and side surfaces of the lines of the mesh metal film are coated with a black coating layer 23. When an error is detected within the system, an error specific message is generated. A structural unit is provided that is comprised of a fuel tank, the UWS tank, and the preliminary muffler, with the structural unit being adapted to be secured in its entirety to the chassis frame of the vehicle.