Highway early warning portal frame

The utility model relates to the technical field of expressway equipment, in particular to an expressway early warning portal frame which comprises a portal frame body, an early warning assembly, portal frame stand columns and a transverse frame arranged between the two stand columns, and the early warning assembly comprises a detection unit and a warning unit. The cross frame and the stand columns are used as the structure of the portal frame, the cross frame is formed by splicing a plurality of square frames, the length of the cross frame can be adjusted according to the width of an expressway, the portal frame is convenient to erect and does not need to be customized according to the width of the expressway, and machining cost is saved; by arranging the weather phenomenon sensor and the radar speed measurement sensor, the weather condition in the portal frame area range and the vehicle running speed can be detected, detection information is transmitted to the PLC, the weather condition is displayed on the