In front of a long tunnel or long tunnel group and the replacement of the pre-export Expressway interchangeset up large variable message signs, traffic conditions for the release front, the tunnel,guidance information, and so on, so that the driver can understand road traffic conditions and the front make judgments. Using ultra-high screen brightness of the LED light emitting diode component is the source of modern transport technology and network, which is an important application. It is separated from fixed way fixed and vehicle-two from the technical sub-screen monochrome variable intelligence panels, dual-color variable intelligence panels, and full color variable intelligence panels.